# StudySquare

# Sine for SQA National 5 Maths

This page covers the following topics:

1. Sine

2. Values and applications

3. Right-angled traingles

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.

# 1

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

0.62

# 2

Find sinB if b = 5 and c = 25.

1/5 or 0.2

# 3

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

0.87

# 4

Which side of the triangle shown is the opposite?

b

# 5

Find sinA if a = 7 cm and c = 10 cm.

7/10 or 0.7

End of page