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Cosine for OCR GCSE Maths

Cosine

This page covers the following topics:

1. Cosine

Cosine of an angle is a ratio between the side adjacent to the angle and the hypotenuse of a triangle.

Cosine

1

Find a if cosB = 0.9 and c = 40.

36

Find a if cosB = 0.9 and c = 40.

2

Find a if cosB = 0.3 and c = 20 cm.

6 cm

Find a if cosB = 0.3 and c = 20 cm.

3

Find b if cosA = 0.5 and c = 10.8.

5.4

Find b if cosA = 0.5 and c = 10.8.

4

Find cosA if b = 3.5 cm and c = 14 cm.

1/4 or 0.25

Find cosA if b = 3.5 cm and c = 14 cm.

5

Find cosB if a = 2 and c = 12.

1/6

Find cosB if a = 2 and c = 12.

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