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SQA National 5 Maths Basic geometry terms

Basic geometry terms

This page covers the following topics:

1. Angles at a point
2. Angles at a point on a straight line
3. Vertically opposite angles
4. Alternate angles
5. Corresponding angles

The sum of the angles at a point is 360ΒΊ. This property can be used to find the value of missing angles.

Angles at a point

The sum of the angles at a point on a straight line is 180ΒΊ. This property can be used to find the value of missing angles.

Angles at a point on a straight line

Vertically opposite angles are angles which are opposite each other at a point. These angles are equal.

Vertically opposite angles

Given two parallel lines, the marked angles on the line joining the two parallel lines are equal. These angles are called alternate angles or Z angles.

Alternate angles

The angles between two parallel lines and a third intersecting lines, as shown on the diagram, are equal. These angles are called corresponding angles or F angles.

Corresponding angles

1

State all the pairs of vertically opposite angles on the given diagram.

State all the pairs of vertically opposite angles on the given diagram.

2

Calculate the value of y.

Calculate the value of y.

3

Calculate the value of angle a.

Calculate the value of angle a.

4

Find the value of b, given that d = 78ΒΊ and f = 83ΒΊ.

Find the value of b, given that d = 78ΒΊ and f = 83ΒΊ.

5

Use alternate angles to find the value of ΞΈ.

Use alternate angles to find the value of ΞΈ.

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