# Worksheet: The Cosine Ratio

In this worksheet, we will practice finding missing lengths in a triangle using the cosine ratios.

**Q7: **

is an isosceles triangle where and . Find the length of giving the answer to one decimal place.

**Q8: **

is a triangle, where , , and . Find the length of , giving your answer to the nearest centimetre.

**Q12: **

is an isosceles triangle where and . Find the length of giving the answer to one decimal place.