Question

ABCD is a rectangle. Angle A measures (4x − 15)° . Find x.

Answer 1

If the shape in question is a rectangle, we know for a fact that each angle is equal to 90 degrees (or a right angle). So, since any given angle is equal to 90, that includes angle A.

4x - 15 = 90
4x = 90 + 15
4x = 105
x = 105/4
x = 26.25