Consider the given triangle.

First, find the value of $\angle BAC$∠BAC.

Find the length of $c$c.

Round your answer to two decimal places.

Consider the following diagram:

Use the sine rule to prove that the area of $\triangle ABC$△ABC is given by the equation $Area=\frac{a^2\sin B\sin C}{2\sin A}$Area=a2sinBsinC2sinA.

We want to prove that the area of a parallelogram is the product of two adjacent sides and the sine of the included angle.