Math 2 Definitions & Basics Flashcards

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Flashcards covering definitions, angle measures, parallel lines, proof language, and miscellaneous concepts from Math 2 lecture notes.

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21 Terms

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Line segment

Part of a line that starts at one point and ends at another.

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Ray

A line that extends indefinitely in one direction.

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Midpoint

A point that divides a segment into two congruent segments.

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Angle bisector

A line or ray that divides an angle into two equal parts.

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Vertex

The common endpoint where the sides of an angle intersect.

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Complementary angles

Two angles whose measures add up to 90°.

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Supplementary angles

Two angles whose measures add up to 180°.

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Right angle

An angle that measures 90°.

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Straight angle

An angle that measures 180°.

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Same side exterior angles

Exterior angles on the same side of the transversal.

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Same side interior angles

Interior angles on the same side of the transversal; they are supplementary.

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Alternate exterior angles

Exterior angles, non-adjacent, and on opposite sides of the transversal; they are equal.

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Alternate interior angles

Interior angles, non-adjacent, and on opposite sides of the transversal; they are equal.

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Corresponding angles

Angles on the same side of the transversal and in the same position; they are equal.

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Vertical angles

Two angles directly across from each other at intersecting lines; they are equal.

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Corresponding Parts of Congruent Triangles are Congruent (CPCTC)

If two triangles are congruent, then all corresponding parts are congruent.

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Substitution Property of Equality

A quantity may be substituted for its equal.

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Reflexive Property

Something is equal to or congruent to itself.

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Transitive Property

If two quantities are equal to the same quantity, then they are equal to each other.

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Isosceles triangle

A triangle with two equal side lengths and base angles of equal measure.

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Exterior angle of a triangle

Equal to the sum of the measures of the remote (or opposite) interior angles.