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100

Two rays that have a common endpoint.

Angle
100

An angle which is equal to 90°.


Right Angle


100

Lines that cross at right angles (90 °) to each other. 

Perpendicular Lines
100
The space inside of a shape
Area
200

A line that goes on forever in one direction.

Ray
200

An angle less than 90°

Acute Angle
200

Two lines that never cross.

Parallel Lines
200
The distance around a shape
Perimeter
300

A dot. An exact location. 

Point
300

An angle that is more than 90° but less than 180°

Obtuse Angle
300
Two lines that cross each other, but not at a right angle
Intersecting Lines
300

Numbers and symbols that show how to work something out.

 L x W = Area S + S + S + S = Perimeter


Formula
400

a straight path that goes on forever in both directions.

Line
400

An angle that is exactly 180°

Straight Angle
400

The imaginary line where you could fold the image in half.


Line of Symmetry
400

the length or width of an object


Dimmension
500

Part of a line with two endpoints.

Line Segment