Question

What type of angle pair is shown below?

What is the value of x?

Answer 1

Answer: 30 degrees
100=4x-20 —>1st Add 20 on both sides
120=4x —>2nd Divide 4 on both sides
30=x
They are opposite angles therefore they are equivalent to each other!!

Answer 2

An obtuse angle.

Opposite angles are equal

4x-20=100

+20

4x =120

÷4

x=30

So, 30 x 4 =120. Then, minus 20 is 100.