A rectangle is, by definition, a parallelogram with four equal angles, all of which equal 90 degrees. If you only know three angles in a rectangle, something is wrong. In order to find the area of a rectangle, you must know its height and length. The area is then found by multiplying these two values together.
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Divide the area by the length will give you the width
Multiply them by eachother.
The one alternative to find the area of a rectangle is when you are given the length of one diagonal and its slope.
If you are given the area you will have to think what do you times with the number you have to get it.
Divide the area by the width and it will give you the length.