Geometry Vocabulary Terms with Pictures

1.

Point

An exact location in space, usually represented by a dot

2.

Angle

A figure formed by two rays that have a common endpoint

3.

Vertex

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

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

5.

Radius

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

6.

Obtuse Triangle

A triangle that has one obtuse angle

7.

Polygon

A closed plane figure formed by three or more line segments

8.

Square

A rectangle with 4 equal sides

9.

Pentagon

A polygon with five sides

10.

Line

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

11.

Right Angle

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

12.

Parallel Line

Lines in a plane that never intersect

13.

Circumference

The distance around a circle

14.

Triangle

A polygon with three sides

15.

Equilateral Triangle

A triangle with three congruent sides

16.

Parallelogram

A quadrilateral whose opposite sides are parallel and congruent

17.

Trapezoid

A quadrilateral with one pair of parallel sides

18.

Closed Figure

A figure that begins and ends at the same point

19.

Line Segment

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

20.

Acute Angle

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

21.

Perpendicular Lines

Two lines that intersect to form four right angles

22.

Chord

A line segment with its endpoints on a circle

23.

Right Triangle

A triangle with one right angle

24.

Isosceles Triangle

A triangle with two congruent sides

25.

Quadrilateral

A polygon with four sides

26.

Hexagon

A polygon with six sides and six angles

27.

Ray

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

28.

Obtuse Angle

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

29.

Intersecting Lines

Lines that cross at exactly one point

30.

Diameter

A line segment that passes through the center of

a circle and has its endpoints on the circle

31.

Acute Triangle

A triangle in which all three angles are acute

32.

Scalene Triangle

A triangle with no congruent sides

33.

Rectangle

A parallelogram with four right angles

34.

Octagon

A polygon with eight sides

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