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SQA National 5 Maths Basic geometry terms 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 360º. This property can be used to find the value of missing angles. The sum of the angles at a point on a straight line is 180º. This property can be used to find the value of missing angles. Vertically opposite angles are angles which are opposite each other at a point. These angles are equal. 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. 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. 1

State all the pairs of vertically opposite angles on the given diagram. 2

Calculate the value of y. 3

Calculate the value of angle a. 4

Find the value of b, given that d = 78º and f = 83º. 5

Use alternate angles to find the value of θ. End of page