content area top Part 1 a. If a circle has a circumference of 10pi cm, what is its area? b. If a circle of radius r and a square with a side of length b have equal areas, express r in terms of b. Question content area bottom Part 1 a. The area of the circle is enter your response here cm squared . cm. cm cubed . (Simplify your answer, including any radicals. Type an exact answer, using pi as needed.) Part 2 b. The radius of the circle is given by requals enter your response here. (Type an expression using b as a variable. Simplify your answer, including any radicals. Type an exact answer, using pi as needed.)