Use these flash cards to help you remember important geometric vocabulary terms!
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| isosceles triangle | A triangle with at least two side lengths and angle measures that are equal.
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| adjacent angles | two angles that share a vertex and side.
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| opposite angles | angles that are "opposite" each other. These types of angles are congruent.
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| scalene triangle | a triangle with no sides or angles of equal measure.
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| obtuse triangle | a triangle with one obtuse angle.
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| right triangle | a triangle with one right angle.
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| exterior angle | an angle on the outside of a polygon after you extend one of its sides.
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| interior angle | an angle on the inside of a polygon.
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| reflex angle | an angle whose measure is greater than 180 degrees and less than 360 degrees.
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| rectangle | a parallelogram with all right angles
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| rhombus | a parallelogram with all equal side lengths
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| parallelogram | opposite side lengths are parallel; opposite angles and sides are congruent.
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| 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.
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| 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.
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| angle sum | the sum of all the measures of the interior angles of a polygon.
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| (n-2) X 180 degrees | formula to find the interior angle sum of a poylgon.
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| (n X 180 degrees) - 360 degrees | formula to find the interior angle sum of a polygon.
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| 360 degrees | the exterior angle sum of any polygon, irregular or regular. Also is the interior angle sum of any quadrilateral.
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| regular polygon | a polygon whose side lengths are congruent, and whose interior and exterior angles are all congruent.
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| How to build a triangle | The sum of the two smaller sides must be greater than the third (longest) side.
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| How to build a quadrilateral | The sum of the three smaller sides must be greater than the fourth (longest) side.
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| 180 degrees | Sum of angles that create a straight angle, or the interior angle sum of a triangle.
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| acute triangle | triangle with all acute angles
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| equilateral triangle | triangle with all side lengths and angle measures being congruent
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Created by:
emains
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