What is the perimeter of a rectangle with a length of 2x + 4 and a width of 4x?
Draw a picture as well.

I'll leave the picture to you; draw a rectangle and write 2x+4 along the length and 4x along the width.   We don't really know the aspect ratio of the rectangle until we know x so any rectangle is fine.

The perimeter is the sum of all four side lengths,

p = (2x + 4) + 4x + (2x + 4) + 4x

p = 12x + 8

answer4 to the second power is 16

and 4 to the third power is 64,

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.