Sine of an angle is a ratio between the side opposite to the angle and the hypotenuse of a triangle.

Sine is one of three trigonometric functions of an angle.

sin(x) is calculated by calculating the ratio of two sides of a right-angled triangle, the opposite and the hypotenuse.

The diagram shows a sine graph.

1

Find the value of sin(A) by using the triangle shown.

2

Find sinB if b = 5 and c = 25.

3

Write down the coordinates of point A on the sine graph.

4

Use your calculator to find the value of sin(60º).

5

Which side of the triangle shown is the opposite?