Basic Geometry Vocabulary Flashcards


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created 2 years ago by amalone
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Grade levels:
5th grade
Subjects:
math, geometry
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1

Polygon

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Closed figure with straight sides

2

Quadrilateral

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4- sided polygon

3

Trapezoid

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A quadrilateral with only one set of parallel lines

4

Parallelogram

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A quadrilateral with two sets of parallel lines

5

Rhombus

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

6

Rectangle

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

7

Square

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

8

Acute Triangle

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

9

Right Triangle

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A triangle that has a right angle (90°)

10

Obtuse Triangle

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A triangle that has an angle greater than 90°

11

Equilateral Triangle

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A triangle with all three sides of equal length.

All angles are acute.

12

Isosceles Triangle

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A triangle with two equal sides.

The angles opposite the equal sides are also equal.

13

Scalene Triangle

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

14

Pentagon

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5-sided polygon

15

Heptagon

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7-sided polygon

16

Hexagon

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6-sided polygon

17

Octagon

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8-sided polygon

18

Decagon

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10- sided polygon