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Cosine for SQA National 5 Maths

Cosine

This page covers the following topics:

1. Cosine
2. Values and applications
3. Right-angled traingles

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

Cosine

Cosine is one of three trigonometric functions of an angle.

Values and applications

cos(x) is found by calculating the ratio of two sides of a right-angled triangle, the adjacent and the hypotenuse.

Right-angled traingles

1

Find a if cosB = 0.9 and c = 40.

36

Find a if cosB = 0.9 and c = 40.

2

Find the value of A in the triangle shown.

46.2ยบ

Find the value of A in the triangle shown.

3

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

6 cm

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

4

Find the length of the line p in the triangle shown.

7.4

Find the length of the line p in the triangle shown.

5

Find b if cosA = 0.5 and c = 10.8.

5.4

Find b if cosA = 0.5 and c = 10.8.

End of page

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