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Geometry Vocab

Use these flash cards to help you remember important geometric vocabulary terms!

QuestionAnswer
isosceles triangle A triangle with at least two side lengths and angle measures that are equal.
adjacent angles two angles that share a vertex and side.
vertical angles angles that are "opposite" each other. These types of angles are congruent.
scalene triangle a triangle with no sides or angles of equal measure.
obtuse triangle a triangle with one obtuse angle.
right triangle a triangle with one right angle.
exterior angle an angle on the outside of a polygon after you extend one of its sides.
interior angle an angle on the inside of a polygon.
reflex angle an angle whose measure is greater than 180 degrees and less than 360 degrees.
rectangle a parallelogram with all right angles
transversal a line that crosses over parallel lines, resulting in pairs of alternate exterior angles, alternate interior angles, and corresponding angles that are congruent.
parallel lines two lines that never intersect
alternate interior angles on opposite sides of the transversal and inside the parallel lines.
alternate exterior angles on opposite sides of the transversal and outside the parallel lines.
corresponding angles In the same position on the parallel lines in relation to the transversal.
complementary angles angle measures that add up to 90 degrees.
supplementary angles angle measures that add up to 180 degrees.
180 degrees Sum of angles that create a straight angle, or the interior angle sum of a triangle.
acute triangle triangle with all acute angles
equilateral triangle triangle with all side lengths and angle measures being congruent
Created by: emains
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