Textbook Problem

For the Review Exercises, give an exact answer unless stated otherwise.

In Review Exercises 1 to 3, draw a figure that enables you to solve each problem.

	Given:	$▱ABCD$ with $AB=8$ and $AD=10$
	Find:	$A_{ABCD}$ if:
	a)	$m\angle A={30}^{\circ }$
	b)	$m\angle A={60}^{\circ }$
	c)	$m\angle A={45}^{\circ }$