Non right angle triangle area rule

Area Rule in non right angle triangles

To find the area of any non right angle triangle you need to know 2 sides and included angle, he same requirements of cosine rule to be used.

Area of a triangle=

•  $\frac{1}{2}a\times b\times\sin C$  

•  $\frac{1}{2}a\times c\times\sin B$  

•  $\frac{1}{2}b\times c\times\sin A$  

Find the area of the triangle shown

•  $\frac{\frac{1}{2}\times15\times22\times\sin45}{ }$  

•  $116.67$