Mathematics 8 4th Quarter Exam Review

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Questions and Answers

In $\triangle ABC$, if $AB = 5$ and $BC = 8$, which of the following could be the length of $AC$ according to the Triangle Inequality Theorem?

  • 12 (correct)
  • 2
  • 3
  • 14

Given $\triangle PQR$, where $PQ = 10$, $QR = 12$, and $RP = 15$. Which angle is the largest?

  • \(\angle Q\) (correct)
  • \(\angle R\)
  • It cannot be determined.
  • \(\angle P\)

If an exterior angle of a triangle measures $120^\circ$, which of the following statements must be true?

  • One of the remote interior angles must be a right angle.
  • One of the remote interior angles must be obtuse.
  • Both remote interior angles are acute. (correct)
  • One of the interior angles must measure $60^\circ$.

In $\triangle XYZ$, $\angle X = 50^\circ$ and $\angle Y = 70^\circ$. Which side is the longest?

<p>$XY$ (C)</p> Signup and view all the answers

Given two triangles $\triangle ABC$ and $\triangle DEF$ where $AB = DE$, $BC = EF$, and $\angle B > \angle E$, what can be concluded about the relationship between $AC$ and $DF$ according to the Hinge Theorem?

<p>$AC &gt; DF$ (B)</p> Signup and view all the answers

If $AC = DF$, $AB = DE$, and $BC > EF$ in triangles $\triangle ABC$ and $\triangle DEF$, which of the following statements is true according to the Converse of the Hinge Theorem?

<p>(\angle B &gt; \angle E) (C)</p> Signup and view all the answers

To prove that the base angles of an isosceles triangle are congruent, which of the following auxiliary lines is typically constructed?

<p>The altitude to the base. (C)</p> Signup and view all the answers

In a proof, which justification supports the statement that $AB + BC > AC$ for any three non-collinear points A, B, and C?

<p>Triangle Inequality Theorem (C)</p> Signup and view all the answers

If two parallel lines are intersected by a transversal, which pair of angles are supplementary?

<p>Same-side interior angles (A)</p> Signup and view all the answers

Given that line $l$ is parallel to line $m$, and both are intersected by transversal $t$. If one of the angles formed is $60^\circ$, what is the measure of its corresponding angle?

<p>$60^\circ$ (A)</p> Signup and view all the answers

To prove that alternate exterior angles formed by parallel lines cut by a transversal are congruent, which theorem is most directly applied after establishing that corresponding angles are congruent?

<p>Vertical Angles Theorem (A)</p> Signup and view all the answers

To prove that same-side interior angles are supplementary, which of the following angle relationships is typically used?

<p>Linear pair (B)</p> Signup and view all the answers

Which of the following describes a sample space in an experiment?

<p>The set of all possible outcomes of an experiment. (C)</p> Signup and view all the answers

A bag contains 3 red marbles and 2 blue marbles. What is the sample space when selecting one marble from the bag?

<p>{red1, red2, red3, blue1, blue2} (B)</p> Signup and view all the answers

What is the definition of an 'event' in probability?

<p>A subset of the sample space. (C)</p> Signup and view all the answers

When rolling a fair six-sided die, what is the event of rolling an even number?

<p>{2, 4, 6} (C)</p> Signup and view all the answers

Which of the following counting methods is best suited for determining the number of ways to arrange books on a shelf, where the order matters?

<p>Permutation (D)</p> Signup and view all the answers

How many ways can you choose 3 students out of a group of 5 for a committee, if the order of selection does not matter?

<p>10 (C)</p> Signup and view all the answers

A restaurant offers 4 appetizers, 5 main courses, and 3 desserts. How many different meals, consisting of one appetizer, one main course, and one dessert, can be ordered?

<p>60 (A)</p> Signup and view all the answers

A coin is flipped three times. What is the probability of getting exactly two heads?

<p>$\frac{3}{8}$ (C)</p> Signup and view all the answers

In $\triangle ABC$, $AB = 7$, $BC = 9$, and $AC = 11$. Which of the following is true about the angles of the triangle?

<p>(\angle C &gt; \angle B &gt; \angle A) (A)</p> Signup and view all the answers

In $\triangle XYZ$, $XY = 6$, $YZ = 8$, and $XZ = 10$. Which angle is the smallest?

<p>(\angle Z) (D)</p> Signup and view all the answers

If an exterior angle of a triangle measures $130^\circ$, what can be concluded about the two remote interior angles?

<p>Both must be acute. (C)</p> Signup and view all the answers

Given two triangles $\triangle ABC$ and $\triangle DEF$ where $AB = DE$, $BC = EF$, and $AC < DF$, what can be concluded about the relationship between $\angle B$ and $\angle E$?

<p>(\angle B &lt; \angle E) (B)</p> Signup and view all the answers

In proving the Triangle Inequality Theorem, why is it important to consider the shortest distance between two points?

<p>To justify that a straight line is the shortest distance (C)</p> Signup and view all the answers

When proving the properties of parallel lines cut by a transversal, which property is often used as a starting point?

<p>Corresponding angles are congruent (A)</p> Signup and view all the answers

Given line $m$ is parallel to line $n$, and both are intersected by transversal $t$. If one of the interior angles on the same side of the transversal is $110^\circ$, what is the measure of the other interior angle on the same side?

<p>$70^\circ$ (A)</p> Signup and view all the answers

What makes an experiment a fair experiment?

<p>Every outcome is equally likely. (A)</p> Signup and view all the answers

A spinner has four equally sized sections colored red, blue, green, and yellow. What is the sample space for spinning the spinner once?

<p>{red, blue, green, yellow} (A)</p> Signup and view all the answers

What is the difference between an outcome and an event?

<p>An outcome is a single result; an event is a set of results. (C)</p> Signup and view all the answers

A bag contains 5 yellow candies, 3 green candies and 2 red candies. What is the probability of drawing either a green or red candy?

<p>$\frac{1}{2}$ (D)</p> Signup and view all the answers

Which counting method is used to find the number of possible outcomes when selecting a president, a vice president, and a treasurer from a group of 10 people?

<p>Permutation (D)</p> Signup and view all the answers

How many different committees of 4 people can be formed from a group of 8 people?

<p>70 (B)</p> Signup and view all the answers

A bakery sells 6 types of donuts. If you want to buy 3 donuts, how many different selections can you make?

<p>56 (D)</p> Signup and view all the answers

A bag contains 4 red balls and 6 blue balls. Two balls are drawn at random without replacement. What is the probability that the first ball is red and the second ball is blue?

<p>$\frac{4}{15}$ (D)</p> Signup and view all the answers

Flashcards

Triangle Inequality Theorem

The sum of any two sides of a triangle is always greater than the third side.

Angle-Side Relationship Theorem

If one angle of a triangle is larger than another angle, then the side opposite the larger angle is longer than the side opposite the smaller angle.

Exterior Angle Inequality Theorem

The measure of an exterior angle of a triangle is greater than the measure of either of its remote interior angles.

Hinge Theorem

If two sides of one triangle are congruent to two sides of another triangle, but the included angle of the first triangle is larger than the included angle of the second, then the third side of the first triangle is longer than the third side of the second triangle.

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Converse of the Hinge Theorem

If two sides of one triangle are congruent to two sides of another triangle, but the third side of the first triangle is longer than the third side of the second triangle, then the included angle of the first triangle is larger than the included angle of the second triangle.

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Theorem

Statements that can be justified by using logic, definitions, and previously proven theorems.

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Parallel lines

Lines in the same plane that do not intersect.

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Transversal line

A line that intersects two or more other lines.

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Corresponding angles

Angles in corresponding positions relative to the transversal and the intersected lines.

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Alternate interior angles

Pairs of angles on opposite sides of the transversal, but inside the two lines.

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Alternate Exterior Angles

Pairs of angles on opposite sides of the transversal, but outside the two lines.

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Consecutive Interior Angles

Angles that lie on the same side of the transversal and between the two lines.

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Outcome

A possible result of an experiment.

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Sample space

The set of all possible outcomes of a random experiment.

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Event

A subset of the sample space.

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Study Notes

  • Pointers to review for Mathematics 8, 4th Quarter Long Test

  • Test Date: March 18, 2025 (Tuesday)

  • Lesson 1: Triangle Inequality Theorem and Angle-Side Relationship Theorem

  • Lesson 2: Exterior Angle Inequality Theorem

  • Lesson 3: Hinge Theorem and its Converse

  • Lesson 4: Proving Inequalities in a Triangle

  • Lesson 5: Properties of Parallel Lines cut by a Transversal line

  • Lesson 6: Proving Properties of Parallel lines cut by a Transversal line

  • Lesson 7: Illustrating an Experiment, Outcome, Sample Space, and Event

  • Lesson 8: Counting Methods and Techniques in an Experiment

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