Mammoth Memory

Angles

Perpendicular- At an angle of 90° to a given line (or plane or surface).

A right angle or 90 degree angle is made by a perpendicular line from another

Purple dictionary (perpendicular) sat on the book shelf at 90° angle.

NOTE:

Purple dictionary is perpendicular to the book shelf.

Example 1

The towers on tower bridge are perpendicular to the road

The towers are perpendicular to the road of the bridge.

 

Example 2

Even a line with an incline can still have a perpendicular line extending out of it

Although the blue line is on an incline, the red line is still at 90° to it and so is perpendicular to the blue line.

 

Example 3

A cubes sides are all perpendicular at right angles

The sides of a cube are perpendicular to each adjoining side.

 

Example 4

A railway sleepers are laid perpendicular to the track

Railway sleepers are laid perpendicular to the track.

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