Quadrilateral ABCD is an isosceles trapezoid with AD is congruent to BC. If the measure of angle A is 5x-3 and the measure of angle B is 4x+12, what is the measure of angle B?
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Answer:
The answer is 72
Step-by-step explanation:
5x - 3 = 4x + 12
5x - 4x -3 = 12
x - 3 = 12
x = 12 + 3
x = 15
B = 4x + 12
B = 4(15) + 12
B = 60 + 12
B = 72