How did you do the pythagorean theorem

The Pythagorean theorem is used to help solve right triangles.

The formula is a^2 + b^2 = c^2

a and b are the straight sides of the triangle and it doesn't matter which one is chosen as a or b.

c is the hypotenuse of the triangle.

Replace the letters in the formula with what you have for dimensions and then solve for the missing dimension.

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

i believe the answer is c.