Podcast
Questions and Answers
Given a triangle with sides measuring 5 cm and 8 cm, which of the following could be the length of the third side, adhering to the Triangle Inequality Theorem?
Given a triangle with sides measuring 5 cm and 8 cm, which of the following could be the length of the third side, adhering to the Triangle Inequality Theorem?
- 2 cm
- 12 cm (correct)
- 14 cm
- 3 cm
If two sides of a triangle are 7 inches and 11 inches, which inequality represents all possible lengths, $x$, for the third side?
If two sides of a triangle are 7 inches and 11 inches, which inequality represents all possible lengths, $x$, for the third side?
- $x > 18$
- $4 > x > 18$
- $4 < x < 18$ (correct)
- $x < 4$
In triangle ABC, AB = 6 cm and BC = 8 cm. What is the range of possible lengths for side AC?
In triangle ABC, AB = 6 cm and BC = 8 cm. What is the range of possible lengths for side AC?
- $AC < 2$
- $AC > 14$
- $2 > AC > 14$
- $2 < AC < 14$ (correct)
Which of the following sets of side lengths can form a triangle?
Which of the following sets of side lengths can form a triangle?
Can a triangle be formed with sides of the following lengths: 4, 5, and 10?
Can a triangle be formed with sides of the following lengths: 4, 5, and 10?
In $\triangle PQR$, if $PQ = 9$ and $QR = 12$, which of the following could be a possible length for PR?
In $\triangle PQR$, if $PQ = 9$ and $QR = 12$, which of the following could be a possible length for PR?
Two sides of a triangle measure 6 cm and 11 cm. Which measurement could not be the length of the third side?
Two sides of a triangle measure 6 cm and 11 cm. Which measurement could not be the length of the third side?
If the sides of a triangle are 3x, 4x, and 5x, what range of values must x have for the triangle to exist?
If the sides of a triangle are 3x, 4x, and 5x, what range of values must x have for the triangle to exist?
Given $\triangle ABC$ with sides $AB=5$, $BC=6$, and $CA=7$. Which angle has the smallest measure?
Given $\triangle ABC$ with sides $AB=5$, $BC=6$, and $CA=7$. Which angle has the smallest measure?
In $\triangle XYZ$, $XY = 8$, $YZ = 10$, and $XZ = 12$. Which angle has the largest measure?
In $\triangle XYZ$, $XY = 8$, $YZ = 10$, and $XZ = 12$. Which angle has the largest measure?
In triangle $DEF$, if $DE = 15$, $EF = 13$, and $DF = 18$, which angle is the largest?
In triangle $DEF$, if $DE = 15$, $EF = 13$, and $DF = 18$, which angle is the largest?
If in $\triangle ABC$, $AB < BC < AC$, then which of the following is true regarding the angles?
If in $\triangle ABC$, $AB < BC < AC$, then which of the following is true regarding the angles?
Given a triangle where $\angle A = 80^\circ$ and $\angle B = 60^\circ$, which side of the triangle is the longest?
Given a triangle where $\angle A = 80^\circ$ and $\angle B = 60^\circ$, which side of the triangle is the longest?
In $\triangle PQR$, if $\angle P = 50^\circ$ and $\angle Q = 70^\circ$, which side is the shortest?
In $\triangle PQR$, if $\angle P = 50^\circ$ and $\angle Q = 70^\circ$, which side is the shortest?
In $\triangle ABC$, if $m\angle A = 90^\circ$, $m\angle B = 60^\circ$, and $m\angle C = 30^\circ$, which side is the longest?
In $\triangle ABC$, if $m\angle A = 90^\circ$, $m\angle B = 60^\circ$, and $m\angle C = 30^\circ$, which side is the longest?
Given $\triangle XYZ$ with $\angle X = 45^\circ$, $\angle Y = 75^\circ$, and $\angle Z = 60^\circ$, arrange the sides in ascending order.
Given $\triangle XYZ$ with $\angle X = 45^\circ$, $\angle Y = 75^\circ$, and $\angle Z = 60^\circ$, arrange the sides in ascending order.
Two triangles, $\triangle ABC$ and $\triangle DEF$, have $AB = DE$ and $BC = EF$. If $m\angle B > m\angle E$, which statement is true according to the Hinge Theorem?
Two triangles, $\triangle ABC$ and $\triangle DEF$, have $AB = DE$ and $BC = EF$. If $m\angle B > m\angle E$, which statement is true according to the Hinge Theorem?
In $\triangle PQR$ and $\triangle STU$, $PQ = ST$ and $QR = TU$. If $PR < SU$, what can be concluded about the angles $\angle Q$ and $\angle T$?
In $\triangle PQR$ and $\triangle STU$, $PQ = ST$ and $QR = TU$. If $PR < SU$, what can be concluded about the angles $\angle Q$ and $\angle T$?
Given $\triangle ABC$ and $\triangle DEF$ where $AB \cong DE$, $BC \cong EF$, and $AC > DF$. Which of the following statements is true?
Given $\triangle ABC$ and $\triangle DEF$ where $AB \cong DE$, $BC \cong EF$, and $AC > DF$. Which of the following statements is true?
Two triangles, $\triangle LMN$ and $\triangle PQR$, have sides such that $LM = PQ$ and $MN = QR$. If $\angle M$ measures $70^\circ$ and $\angle Q$ measures $55^\circ$, which of the following is always true?
Two triangles, $\triangle LMN$ and $\triangle PQR$, have sides such that $LM = PQ$ and $MN = QR$. If $\angle M$ measures $70^\circ$ and $\angle Q$ measures $55^\circ$, which of the following is always true?
In $\triangle ABC$, point D is on side AC such that BD bisects $\angle ABC$. If $AB=8$, $BC=10$, then which of the following must be true?
In $\triangle ABC$, point D is on side AC such that BD bisects $\angle ABC$. If $AB=8$, $BC=10$, then which of the following must be true?
Given that in $\triangle ABC$, $\angle A$ is an obtuse angle, which side is the longest?
Given that in $\triangle ABC$, $\angle A$ is an obtuse angle, which side is the longest?
If $m\angle 1 = 130^\circ$ is an exterior angle of a triangle, what can you conclude about the measures of the two non-adjacent interior angles?
If $m\angle 1 = 130^\circ$ is an exterior angle of a triangle, what can you conclude about the measures of the two non-adjacent interior angles?
In a triangle, if one exterior angle measures $120^\circ$, what is the largest possible measure of one of the remote interior angles?
In a triangle, if one exterior angle measures $120^\circ$, what is the largest possible measure of one of the remote interior angles?
Considering the Exterior Angle Inequality Theorem, which statement is always true about an exterior angle of a triangle?
Considering the Exterior Angle Inequality Theorem, which statement is always true about an exterior angle of a triangle?
Given $\triangle ABC$, where D is a point on BC such that AD is not an altitude. If $\angle ADB$ is obtuse, then...
Given $\triangle ABC$, where D is a point on BC such that AD is not an altitude. If $\angle ADB$ is obtuse, then...
In quadrilateral ABCD, diagonals AC and BD intersect at point E. If $AB = BC$ and $\angle AEB > \angle BEC$, then:
In quadrilateral ABCD, diagonals AC and BD intersect at point E. If $AB = BC$ and $\angle AEB > \angle BEC$, then:
In $\triangle ABC$, point $D$ lies on $BC$ such that $AD$ bisects $\angle BAC$. If $AB = 10$ and $AC = 15$, what can be said about the lengths of $BD$ and $DC$?
In $\triangle ABC$, point $D$ lies on $BC$ such that $AD$ bisects $\angle BAC$. If $AB = 10$ and $AC = 15$, what can be said about the lengths of $BD$ and $DC$?
If in $\triangle ABC$, $D$ is a point on $BC$ such that $AD \perp BC$. Which of the following is always true?
If in $\triangle ABC$, $D$ is a point on $BC$ such that $AD \perp BC$. Which of the following is always true?
Given the sides of a triangle are 5, 7 and 8, arrange the angles ($\angle A$, $\angle B$, $\angle C$) from smallest to largest, where $A$ is opposite the side of length 5, $B$ is opposite the side of length 7, and $C$ is opposite the side of length 8.
Given the sides of a triangle are 5, 7 and 8, arrange the angles ($\angle A$, $\angle B$, $\angle C$) from smallest to largest, where $A$ is opposite the side of length 5, $B$ is opposite the side of length 7, and $C$ is opposite the side of length 8.
In triangles $\triangle ABC$ and $\triangle DEF$, $AB=DE$ and $BC=EF$. It is known that $AC > DF$. Which of the following can be concluded?
In triangles $\triangle ABC$ and $\triangle DEF$, $AB=DE$ and $BC=EF$. It is known that $AC > DF$. Which of the following can be concluded?
Which of the following statements correctly uses the Hinge Theorem?
Which of the following statements correctly uses the Hinge Theorem?
If you were to apply triangle inequalities to estimate the distance between three cities, A, B, and C, what real-world assumption must you make to apply the theorem correctly?
If you were to apply triangle inequalities to estimate the distance between three cities, A, B, and C, what real-world assumption must you make to apply the theorem correctly?
In the real world, how might understanding triangle inequalities help ensure the structural integrity of a bridge design?
In the real world, how might understanding triangle inequalities help ensure the structural integrity of a bridge design?
A surveyor needs to determine the possible distances between two points across a lake. He knows the distance from his position to each of the points. How can he use the Triangle Inequality Theorem?
A surveyor needs to determine the possible distances between two points across a lake. He knows the distance from his position to each of the points. How can he use the Triangle Inequality Theorem?
How does the concept of triangle inequality apply to navigation and route planning?
How does the concept of triangle inequality apply to navigation and route planning?
Given a fixed length of fencing material, how does the Triangle Inequality Theorem inform the maximum area you can enclose in a triangular shape?
Given a fixed length of fencing material, how does the Triangle Inequality Theorem inform the maximum area you can enclose in a triangular shape?
How could the principles behind the triangle inequality theorem be applied to optimize network routing in computer science?
How could the principles behind the triangle inequality theorem be applied to optimize network routing in computer science?
Consider the design of a suspension bridge. How does understanding triangle inequalities contribute to the stability and safety of the structure?
Consider the design of a suspension bridge. How does understanding triangle inequalities contribute to the stability and safety of the structure?
Imagine you're placing two security cameras to cover a specific area. How might triangle inequalities guide your decision-making?
Imagine you're placing two security cameras to cover a specific area. How might triangle inequalities guide your decision-making?
How can understanding triangle inequalities aid in architectural design, particularly in ensuring the stability of roof structures?
How can understanding triangle inequalities aid in architectural design, particularly in ensuring the stability of roof structures?
Explain how triangle inequalities could be applied to GPS technology to improve the accuracy of location tracking.
Explain how triangle inequalities could be applied to GPS technology to improve the accuracy of location tracking.
Flashcards
What is a KWL chart?
What is a KWL chart?
A chart used to record what students Know, what they Want to learn, and what they have Learned about a topic.
What is 4 Pics 1 Word?
What is 4 Pics 1 Word?
A game where each level shows four pictures linked by one word that the player has to guess using given letters.
Triangle Inequality Theorem
Triangle Inequality Theorem
In a triangle, the sum of the lengths of any two sides must be greater than the length of the third side.
Unequal Sides Theorem
Unequal Sides Theorem
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Unequal Angles Theorem
Unequal Angles Theorem
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Hinge Theorem
Hinge Theorem
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Converse of the Hinge Theorem
Converse of the Hinge Theorem
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Exterior Angle Inequality Theorem
Exterior Angle Inequality Theorem
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Study Notes
Work Plan Overview
- The work plan involves four stages: explore, firm-up, deepen, and transfer.
- Stage 1: Explore involves using a KWL chart.
- Stage 2: Firm-up includes "4 Pics 1 Word" and "Triangle or Not."
- Stage 3: Deepen involves "Arrange Me!" and "Complete It!"
- Stage 4: Transfer focuses on proving the theorems.
4 Pics 1 Word
- Each level presents four pictures linked by a common word.
- The aim is to identify the word using a set of letters provided.
Triangle Inequalities Theorems
Learning Competency
- Illustrate theorems on triangle inequalities, including Exterior Angle Inequality Theorem, Triangle Inequality Theorem, and Hinge Theorem (M8GE-IVa-).
- Apply theorems on triangle inequalities (M8GE-IVb-1).
- Prove inequalities in a triangle (M8GE-IVc-1).
Triangle Inequality Theorem
- The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
- Given triangle ABC: AC + CB > AB, AC + AB > BC, and AB + BC > AC
Triangle Side Length Example
- Problem: verify if a triangle can be constructed with sides 5 cm, 6 cm, and 7 cm.
- Solution: 5 cm + 6 cm > 7 cm, 6 cm + 7 cm > 5 cm , and 5 cm + 7 cm > 6 cm, so a triangle can be constructed.
- Problem: can a triangle be constructed with sides of lengths 3 cm, 9 cm, and 10 cm.
- Solution: 3 cm + 9 cm > 10 cm is false so a triangle cannot be constructed from those measurements
Triangle Side Length - Range Example
- In triangle BOS, BO = 8, OS = 10, and BS = x. The range of possible values for BS is:
- x must be greater than 2 and less than 18, thus 2 < BS < 18.
Triangle or Not
- Determine if a given set of lengths can form a triangle. Write "T" if it can, or "NT" if it cannot.
Drills
- Determine if a triangle can be constructed with given side lengths, e.g., 7cm, 10cm, and 13cm.
- Find the range of possible values for a side, e.g., in ΔMAT, MA = 16, AT = 20, and MT = x, what is the range of possible values for MT?
Unequal Sides Theorem
- If one side of a triangle is longer than another, the angle opposite the longer side is larger than the angle opposite the shorter side.
- If BC > AC, then m∠A > m∠B.
Arrange Sides Example
- Arrange sides in descending order based on their lengths.
Unequal Angles Theorem
- If one angle of a triangle is larger than another, then the side opposite the larger angle is longer than the side opposite the smaller angle.
- If m∠A > m∠C, then BC > AB.
Arrange Angles Example
- Arrange the angles in descending or decreasing order. Given the measures of the angles
- Solution: From triangle TVS where ∠V =70°, ∠A=60° and ∠T = 50°, then m∠V > m∠A > m∠T
Arrange Me!
- Arrange the angles or sides in descending order or decreasing order.
- Arrange the angles or sides in ascending order or increasing order.
Hinge Theorem
- If two triangles have two sets of congruent sides, the larger included angle will have the longer third side.
Converse of the Hinge Theorem
- If two triangles have two congruent sides, then the triangle with the longer third side will have a larger angle opposite that third side.
Complete Me!
- Complete statements using >, <, or = based on given triangle properties.
Exterior Angles Inequality Theorem
- The measure of an exterior angle of a triangle equals the sum of the two remote interior angles.
- Exterior Angle = Remote Interior Angle 1 + Remote Interior Angle 2.
- ∠4 = ∠1 + ∠3, ∠4 > ∠2, and ∠4 > ∠3
Exterior Angles Example
- Use the Exterior Angles Inequality Theorem and sum of all angles in a triangle to determine the measures of unidentified angles.
Prove It!
- Using the measures of angles and the side lengths of a triangle, apply theorems to prove if it is a true geometrical statement
- Given LC ≅ CU and CU ≅ UK and m∠K > m∠1, prove UL > CK
Prove Me True
- Given LO ≅ LE and VE ≅ VO, prove m∠1 < m∠3.
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