GCSE(F),

There are a number of terms that are used throughout Geometry that need to be known.

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

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** are two, straight lines that always stay the same distance apart (like straight railway lines). The lines never meet.

An **angle** is the measurement of the turn between two intersecting lines and is measured in degrees.

An angle of 90 degrees is a **right angle**. Where one line intersects another line at right angles, the lines are said to be **perpendicular** to each other. A right angle is shown on a drawing with a squared angle symbol, rather than a curved angle symbol.

1. What is an angle of 90º called?

Answer: A Right Angle

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

2. What is the angle formed by a perpendicular line?

Answer: 90º

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

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