
StudySquare
Cosine for SQA National 5 Maths







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 is one of three trigonometric functions of an angle.
cos(x) is found by calculating the ratio of two sides of a right-angled triangle, the adjacent and the hypotenuse.
1
Find a if cosB = 0.9 and c = 40.
36
2
Find the value of A in the triangle shown.
46.2º

3
Find a if cosB = 0.3 and c = 20 cm.
6 cm
4
Find the length of the line p in the triangle shown.
7.4

5
Find b if cosA = 0.5 and c = 10.8.
5.4
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