# 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

5

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°

11

Equilateral Triangle

A triangle with all three sides of equal length.

All angles are acute.

12

Isosceles Triangle

A triangle with two equal sides.

The angles opposite the equal sides are also equal.

13

Scalene Triangle

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

14

Pentagon

5-sided polygon

15

Heptagon

7-sided polygon

16

Hexagon

6-sided polygon

17

Octagon

8-sided polygon

18

Decagon

10- sided polygon