Please help, I’m confused! This is a Two-Step Linear Equations. I really would appreciate if someone could help me out!

• Create an equation to the problem
• Solve the equation
• Verify the equation

x=120-20

x=100

So,the square is 100 cm long

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.