Can someone explain how to solve for X? I want to know how to solve it myself

The circumference of a circle is 5 pi cm. what is the area of the circle?

Which sentence describes why polygon mnop is congruent to polygon jklp? a. polygon jklp maps to polygon mnop through a translation. b. polygon jklp maps to polygon mnop through a rotation. c. polygon jklp maps to polygon mnop through a dilation. d. polygon jklp maps to polygon mnop through a stretch.

Which of the following is correct interpretation of the expression -4+13