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Geometry Vocab
Use these flash cards to help you remember important geometric vocabulary terms!
| Question | Answer |
|---|---|
| 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
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