# Basic Geometry Vocabulary Flashcards

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created 2 years ago by amalone
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math, geometry
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1

Polygon Closed figure with straight sides

2 4- sided polygon

3

Trapezoid A quadrilateral with only one set of parallel lines

4

Parallelogram A quadrilateral with two sets of parallel lines

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Rhombus A parallelogram (two sets of parallel sides) with all sides the same length

6

Rectangle A parallelogram (two sets of parallel sides) with four right angles, opposite sides are of equal length

7

Square A rhombus (2 sets of parallel lines, all sides of equal length) with four right angles

8

Acute Triangle A triangle that has all angles less than 90° (90° is a Right Angle)

9

Right Triangle A triangle that has a right angle (90°)

10

Obtuse Triangle A triangle that has an angle greater than 90°

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Equilateral Triangle A triangle with all three sides of equal length.

All angles are acute.

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Isosceles Triangle A triangle with two equal sides.

The angles opposite the equal sides are also equal.

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Scalene Triangle A triangle with all sides of different lengths.
All angles are different, too.

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Pentagon 5-sided polygon

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Heptagon 7-sided polygon

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Hexagon 6-sided polygon

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Octagon 8-sided polygon

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Decagon 10- sided polygon