Non-right-angled Triangles

Summary

for triangles without a right angle, the sine rule, the cosine rule and the area formula can be used to solve triangles and find their areas.

Key Skills

use the sine rule to solve triangles where two sides and one opposite angle or two angles and one opposite side are given.

use the cosine rule to solve triangles where two sides and the included angle or three sides are given.

find the area of a non-right-angled triangle using the area formula.

Vocabulary

sine rulecosine rulearea formula.