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Geometrical Terms

Geometrical Terms

A point A point is a specific location on a diagram or on a graph. It may be shown as a dot, given as a measurement or as a set of co-ordinates.

A straight line A line is a path between two points. A straight line is the shortest distance between two point. A line has a length.

Parallel lines Parallel lines are two, straight lines that always stay the same distance apart. The lines never meet.

An Angle between two lines An angle is the measurement of the turn between two intersecting lines. Angles are measured in degrees.

A right angle and perpendicular line An angle of 90 degrees is a right angle. Where one line intersects another line at a right angle, the lines are perpendicular to each other.

Example 1

What is an angle of 90º called?

A Right Angle is 90º. It is shown as a square on diagrams, rather than as a curve.

Answer: A Right Angle

Example 2

What is the angle formed by a perpendicular line?

A perpendicular line intersects another line at a right angle, or 90º.

Answer: 90º