Geometry Vocabulary Terms with Pictures

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created 7 years ago by jingle
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Common geometry terms that make learning geometry easier. Includes a picture for each term.
Grade levels:
6th grade, 7th grade, 8th grade, 9th grade, 10th grade, 11th grade, 12th grade, College: First year, College: Second year
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1

Point

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An exact location in space, usually represented by a dot

2

Angle

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A figure formed by two rays that have a common endpoint

3

Vertex

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The point where two or more rays meet; the point of intersection of two sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone; the plural of vertex is vertices

4

Circle

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A closed plane figure with all points on the figure the same distance from the center

5

Radius

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A line segment with one endpoint at the center of a circle and the other endpoint on the circle

6

Obtuse Triangle

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A triangle that has one obtuse angle

7

Polygon

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A closed plane figure formed by three or more line segments

8

Square

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A rectangle with 4 equal sides

9

Pentagon

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A polygon with five sides

10

Line

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A straight path in a plane that goes on forever in opposite directions

11

Right Angle

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An angle formed by perpendicular lines, line segments, or rays and with a measure of 90°

12

Parallel Line

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Lines in a plane that never intersect

13

Circumference

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The distance around a circle

14

Triangle

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A polygon with three sides

15

Equilateral Triangle

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A triangle with three congruent sides

16

Parallelogram

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A quadrilateral whose opposite sides are parallel and congruent

17

Trapezoid

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A quadrilateral with one pair of parallel sides

18

Closed Figure

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A figure that begins and ends at the same point

19

Line Segment

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A part of a line that includes two points, called endpoints, and all of the points

20

Acute Angle

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An angle that has a measure less than a right angle (less than 90°)

21

Perpendicular Lines

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Two lines that intersect to form four right angles

22

Chord

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A line segment with its endpoints on a circle

23

Right Triangle

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A triangle with one right angle

24

Isosceles Triangle

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A triangle with two congruent sides

25

Quadrilateral

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A polygon with four sides

26

Hexagon

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A polygon with six sides and six angles

27

Ray

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A part of a line, with one endpoint, that continues without end in one direction

28

Obtuse Angle

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An angle whose measure is greater than 90° and less than 180°

29

Intersecting Lines

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Lines that cross at exactly one point

30

Diameter

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A line segment that passes through the center of
a circle and has its endpoints on the circle

31

Acute Triangle

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A triangle in which all three angles are acute

32

Scalene Triangle

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A triangle with no congruent sides

33

Rectangle

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A parallelogram with four right angles

34

Octagon

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A polygon with eight sides