14. You are trying to find the area of a circle. The formula to find the area of a circle is a=3.14r^2 (3.14 being Pi). If you substitute 25 as r (radius given) then multiply, your answer should be approximately 1962.5
15. You would use the same formula as #14. a=3.14r^2, and the radius is 6 so your answer would be approximately 113.04
