Question

Which proportion could be used to find the length of side b?сba64°85%A9.3B

Answer 1

The Solution.

Step 1:

We shall find the third angle in the triangle.

`\begin{gathered} \angle C=180-(64+85)\text{ ( sum of angles in a triangle)} \\ \angle C=180-149=31^o \end{gathered}`

Step 2:

we shall determine the proportion to find side b by applying the Sine Rule.

`(\sin 31^o)/(9.3)=(\sin 85^o)/(b)`