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Questions and Answers
What is the definition of inductive reasoning?
What is a conjecture?
A statement/conclusion drawn from reasoning.
What does a counterexample do?
Proves the conjecture to be false.
Define a point.
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What is the definition of a line?
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What is a plane?
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What is the definition of space in geometry?
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What are collinear points?
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What are noncollinear points?
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What are coplanar points?
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What are noncoplanar points?
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Name the three undefined terms of geometry.
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What is a postulate?
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Define a segment.
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What is a ray?
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What are opposite rays?
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What are parallel lines?
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Define perpendicular lines.
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What are skew lines?
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What does oblique mean?
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What are parallel planes?
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What are congruent segments?
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What is the segment addition postulate?
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Define midpoint.
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What is an angle?
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What are congruent angles?
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Explain the angle addition postulate.
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What is a perpendicular bisector?
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What is an angle bisector?
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What is a conditional statement?
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What is a converse?
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What is an inverse?
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Define contrapositive.
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What is a biconditional statement?
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What is deductive reasoning?
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What is the additional property?
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What is the subtraction property?
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Define multiplication property.
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What is the division property?
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Define the reflexive property.
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What is the symmetric property?
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What is the transitive property?
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What is the substitution property?
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What is the distributive property?
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What does combining like terms entail?
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What are vertical angles?
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What are adjacent angles?
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Define complementary angles.
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What are supplementary angles?
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What is a theorem?
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Define an acute angle.
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What is a right angle?
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Define an obtuse angle.
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What is a straight angle?
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What does the term congruent mean?
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What is a hypothesis in a conditional statement?
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What is a conclusion in a conditional statement?
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What is a transversal?
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What are alternate interior angles?
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What are alternate exterior angles?
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What are same-side interior angles?
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What are same-side exterior angles?
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Define corresponding angles.
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What does transformation refer to in geometry?
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What is a preimage?
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What is an image?
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Define isometry.
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What is a reflection in geometry?
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What is the line of reflection?
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What is a translation?
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What is rotation?
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What is the point of rotation?
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Define symmetry.
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What is reflectional symmetry?
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What is rotational symmetry?
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What is dilation?
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What is enlargement in geometry?
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What does reduction mean?
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What is a construction in geometry?
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What are congruent polygons?
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What does the Triangle Angle-Sum Theorem state?
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What are remote interior angles?
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What does the Triangle Exterior Angle Theorem state?
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Define the Third Angles Theorem.
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What is the SSS Postulate?
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What is the SAS Postulate?
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What is the ASA Postulate?
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What is the AAS Theorem?
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What is the HL Theorem?
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What is a proof in geometry?
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What does CPCTC stand for?
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What is a midsegment in a triangle?
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What does the midsegment theorem state?
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What are cevians?
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What is a perpendicular bisector?
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Define angle bisector.
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What is a median in a triangle?
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What is an altitude in a triangle?
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Define concurrent lines.
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What is the point of concurrency?
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Study Notes
Inductive Reasoning and Conjectures
- Inductive reasoning relies on observations to identify patterns.
- A conjecture is a conclusion drawn from reasoning or observations and can be proven or disproven.
Geometric Fundamentals
- A point has no shape or size and represents a specific location in space.
- A line is a set of points extending infinitely in two directions.
- A plane is a two-dimensional flat surface extending infinitely.
- Space encompasses all points in three dimensions.
Collinearity and Coplanarity
- Collinear points lie on the same line, while noncollinear points do not.
- Coplanar points exist within the same plane; noncoplanar points do not.
Undefined Terms and Postulates
- The three undefined terms in geometry are point, line, and plane.
- A postulate is an accepted fact that does not require proof, also termed as an axiom.
Line Segments and Rays
- A segment consists of part of a line with two endpoints.
- A ray has one endpoint and extends infinitely in one direction.
- Opposite rays are two rays extending in opposite directions from a common endpoint.
Parallel and Perpendicular Lines
- Parallel lines are coplanar and never intersect.
- Perpendicular lines intersect to form four right angles.
- Skew lines are noncoplanar and cannot be parallel.
Angle Fundamentals
- An angle is formed by two rays sharing a common endpoint called the vertex.
- Congruent angles have the same measure, while vertical angles are pairs of opposite angles formed by intersecting lines.
Angle Relationships
- Complementary angles sum to 90 degrees.
- Supplementary angles sum to 180 degrees.
- The angle addition postulate allows for the determination of an angle's measure through the sum of smaller angles.
Triangle and Angle Theorems
- The Triangle Angle-Sum Theorem states that the sum of angles in a triangle is always 180 degrees.
- Remote interior angles are nonadjacent interior angles that relate to an exterior angle according to the Triangle Exterior Angle Theorem.
Congruence Postulates
- SSS, SAS, ASA, AAS, and HL are congruence postulates and theorems dictating when triangles are congruent based on their sides and angles.
Properties of Equality
- The reflexive, symmetric, transitive, and substitution properties describe how equalities function in mathematical expressions.
- The distributive property allows for the multiplication to be distributed over addition.
Transformations and Symmetry
- Transformations change a figure's position, shape, or size, including translations (sliding), rotations (turning), and reflections (flipping).
- Symmetry exists when a figure can be divided equally, either through reflectional or rotational symmetry.
Congruent Figures and Polygons
- Congruent polygons have congruent corresponding parts, including sides and angles.
- Midsegments of triangles connect midpoints of two sides and are parallel to the non-connected side.
Proofs and Logical Reasoning
- Proofs are structured methods for validating mathematical concepts through logical steps.
- CPCTC (Corresponding Parts of Congruent Triangles are Congruent) is used after proving triangle congruence.
Special Segments in Triangles
- Medians connect vertices to midpoints, altitudes drop perpendicular from a vertex to the opposite side, and angle bisectors divide angles into two equal parts.
- Concurrent lines meet at a single point called the point of concurrency.
Special Properties Related to Angles
- Alternate interior angles lie on opposite sides of a transversal and are nonadjacent.
- Corresponding angles are in the same position relative to the traversing line and the two intersected lines.
Studying That Suits You
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Description
Explore essential geometry terms with this flashcard quiz. Each card presents a key term along with its definition, helping you strengthen your understanding of geometric concepts. Perfect for students needing a quick review or anyone wanting to familiarize themselves with geometry terminology.