The Cosine Rule

In a triangle $X Y Z$ , the length of side $XY\,$ is 9.4 km and the length of side $XZ\,$ is 13.1 km. The angle at $X\,$ is $48∘48^\circ$ .

Work out the length of $Y Z$ .
Give your answer to 3 significant figures.

[3]

In a triangle $X Y Z$ , the length of side $XY\,$ is 9.4 km and the length of side $XZ\,$ is 13.1 km. The angle at $X\,$ is $48∘48^\circ$ .

Work out the length of $Y Z$ .
Give your answer to 3 significant figures.

[3]

The Cosine Rule Questions