# Cosine Law

## Interactive practice questions

Find the length of $a$a using the cosine rule.

Easy
Approx 4 minutes

Find the length of $a$a using the cosine rule.

Find the length of $a$a using the cosine rule.

Find the length of $q$q using the cosine rule.

### Outcomes

#### 10D.T3.02

Explore the development of the cosine law within acute triangles

#### 10D.T3.03

Determine the measures of sides and angles in acute triangles, using the sine law and the cosine law