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Geometry Vocab

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

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.
opposite 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
rhombus a parallelogram with all equal side lengths
parallelogram opposite side lengths are parallel; opposite angles and sides are congruent.
rotation symmetry a shape has this symmetry if it can be rotated less than a full turn and it looks exactly as it did before it was rotated.
reflection symmetry a shape with reflection symmetry has two halves that are mirror images of each other after drawing a line of symmetry through it.
angle sum the sum of all the measures of the interior angles of a polygon.
(n-2) X 180 degrees formula to find the interior angle sum of a poylgon.
(n X 180 degrees) - 360 degrees formula to find the interior angle sum of a polygon.
360 degrees the exterior angle sum of any polygon, irregular or regular. Also is the interior angle sum of any quadrilateral.
regular polygon a polygon whose side lengths are congruent, and whose interior and exterior angles are all congruent.
How to build a triangle The sum of the two smaller sides must be greater than the third (longest) side.
How to build a quadrilateral The sum of the three smaller sides must be greater than the fourth (longest) side.
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