In a parallelogram ABCD, If angle A is (3x-20) and angle B is (y+15) and angle c is (x+40). Find the measure of the angels
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A= 70 B= 60 C= 70 D= 60
Step-by-step explanation:
since opposite sides of parallelogram are equal.
so angle A = angle C. and angle B = angle D
3x-20 = x+40
3x-x = 40+20
2x = 60
x = 60/2
x = 30
angle A = 3x-20 = 3×30-20 = 90-20 = 70
angle C = 70
A+B+C+D = 360
70+70+y+15+y+15 = 360
170 + 2y = 360
2y = 360-170
y = 90/2
y = 45
angle B = y+15 = 45+15 = 60
angle D = 60
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