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Angles (F)

To be successful, a snooker player needs to know all about angles.

Angles (F)

Master key angle facts for GCSE Foundation. Learn complementary, supplementary, and full-turn rules to find missing angles in triangles, around points, and on straight lines.

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Fascinating Fact:

Eight equal slices mean each central angle is 360 ÷ 8 = 45°. Halve the slices and each slice’s angle doubles.

In GCSE Maths (Foundation), angle facts help you find unknowns quickly. Use rules for straight lines (180°), around a point (360°), triangles (180°), and vertically opposite angles (equal).

Key Terms

Complementary angles: Two angles that add to 90°.
Supplementary angles: Two angles that add to 180°.
Vertically opposite angles: Equal angles made by two crossing lines.

Frequently Asked Questions (Click to see answers)

What are the basic angle rules for GCSE Foundation?

Key rules: straight line totals 180°, around a point totals 360°, triangle totals 180°, and vertically opposite angles are equal.

How do I find a missing angle on a straight line?

Add the known angles and subtract from 180°. For example, if one angle is 112°, the adjacent angle is 180° − 112° = 68°.

What is a right angle and how many degrees is it?

A right angle is the corner of a square. It measures exactly 90° and is shown by a small square at the vertex.

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You can find more about this topic by visiting BBC Bitesize - Angles, lines and polygons

Author: Sally Thompson (MSc Operational Research, Secondary Maths Teacher & Quiz Writer)

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