Question

In a parallelogram cars, angle c=5x-20 and angle a=3x+20.find x.

Answer 1

in a parallelogram
angle c + AngleA=180
5x-20+3x+20=180
8x=180
x=2.25

Answer 2

given : ABCD is a parallelogram

$\angle c = 5x-20 \\\\\angle A = 3x+20$

to find : value of x

solution :

since , ABCD is a parallelogram

we know that

opposite angle of the parallelogram are equal

thus

$\angle A = \angle C$

3x+20 = 5x-20

3x-5x = -20-20

-2x = -40

2x = 40

x = 20

hence ,The value of x is 20°

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