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Common Core Math 7 PLUS – Unit 8 Vocabulary acute angle Acute Triangle adjacent angles Alternate exterior angles Definitions of Critical Vocabulary and Underlying Concepts an angle that measures less than 90 degrees a triangle whose angles are all less than 90⁰ angles that share a vertex and a side but no points in their interiors Pairs of angles found on the exterior of two lines and on opposite sides of the transversal Alternate interior angles Pairs of angles found on the interior of two lines and on opposite sides of the transversal angle complementary angles two rays meet at an endpoint two angles whose sum is 90 degrees Congruent angles Congruent Triangles Angles that have the same measure triangles whose corresponding sides are congruent and corresponding angles are congruent - these triangles are the same shape and size Corresponding angles Equilateral Triangle Isosceles Triangle Line Segment Isosceles Triangle A pair of angles formed by a transversal and two lines a triangle with three congruent sides a triangle with at least two congruent sides A straight line with exactly two endpoints a triangle with two congruent sides obtuse angle Obtuse Triangle Parallel lines protractor Ray right angle right triangle Scalene Triangle straight angle supplementary angles Transversal triangle Triangle Sum Theorem an angle that measures more than 90 degrees but less than 180 a triangle with one obtuse angle Lines that lie in the same plane but never intersect an instrument used to measure angles in degrees A part of a line with exactly one endpoint an angle that measures exactly 90° a triangle with one right angle a triangle with no congruent sides an angle that measures exactly 180° two angles whose sum is 180 degrees A line that cuts through two or more parallel lines a closed figure consisting of three line segments the three angles of any triangle will always total 1800 vertical angles a pair of non-adjacent angles formed by the intersection of two straight lines; vertical angles are congruent Common Core Math 7 PLUS – Unit 8 Vocabulary acute angle Acute Triangle adjacent angles Alternate exterior angles Definitions of Critical Vocabulary and Underlying Concepts an angle that measures less than 90 degrees a triangle whose angles are all less than 90⁰ angles that share a vertex and a side but no points in their interiors Pairs of angles found on the exterior of two lines and on opposite sides of the transversal Alternate interior angles Pairs of angles found on the interior of two lines and on opposite sides of the transversal angle complementary angles two rays meet at an endpoint two angles whose sum is 90 degrees Congruent angles Congruent Triangles Angles that have the same measure triangles whose corresponding sides are congruent and corresponding angles are congruent - these triangles are the same shape and size Corresponding angles Equilateral Triangle Isosceles Triangle Line Segment Isosceles Triangle A pair of angles formed by a transversal and two lines a triangle with three congruent sides a triangle with at least two congruent sides A straight line with exactly two endpoints a triangle with two congruent sides obtuse angle Obtuse Triangle Parallel lines protractor Ray right angle right triangle Scalene Triangle straight angle supplementary angles Transversal triangle Triangle Sum Theorem an angle that measures more than 90 degrees but less than 180 a triangle with one obtuse angle Lines that lie in the same plane but never intersect an instrument used to measure angles in degrees A part of a line with exactly one endpoint an angle that measures exactly 90° a triangle with one right angle a triangle with no congruent sides an angle that measures exactly 180° two angles whose sum is 180 degrees A line that cuts through two or more parallel lines a closed figure consisting of three line segments the three angles of any triangle will always total 1800 vertical angles a pair of non-adjacent angles formed by the intersection of two straight lines; vertical angles are congruent
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