Suppose the parallelogram shown has angles defined by the following expressions: angle A = 6x + 19; angle B = 3x - 21; angle C = 6x + 19; and angle D = 3x - 21? What is the measure of the largest angle?

Answer 1

What do you know about parallelograms? These questions don't just come out of the blue, you know.

The angles add up to 360°. That is,

6x+19 + 3x-21 + 6x+19 + 3x-21 = 360
18x-4 = 360
x = 20.222°

6x+19 = 140.333
3x-21 = 39.666