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# StudySquare

# Edexcel GCSE Maths Cosine

This page covers the following topics:

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.

The diagram shows a cosine graph.

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If x is an angle in a triangle with adjacent = 4 and hypotenuse = 5, what is the value of cos(x)?

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A triangle has hypotenuse 15, opposite 12 and adjacent 9. What is the value of cos x where x is the angle in the triangle, and hence what is the value of x?

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