cosine rule

cosine rule

- what is a cosine rule

- how to solve using cosine rule

-practice

-feedback

Open Ended

What is Cosine rule?

lets do some examples

Example 1

Calculate the length of side AC of the triangle shown

Example 2

Calculate angle A given the triangle

Example 3

How long is leg c?

Multiple Choice

What is the length of side b?

• 6.36

• 7.11

• 7.78

• 8.06

Multiple Choice

What is the length of side c?

• 4.63

• 4.73

• 5.60

• 6.41

Multiple Choice

What is the length of side q?

• 16.9

• 19.24

• 21.08

• 21.32

Multiple Choice

What is the length of angle A?

• 33.6

• 54.7

• 62.2

• 84.3

Multiple Choice

What is the length of angle Q?

• 35.8

• 40.6

• 56.8

• 82.6

Poll

did you understand Cosine rule?

• yes

• no

• more practice