3.14 times the square of ur radius is equal to area of a circle. So in this case , they having the given circumference of 3pi , then u divided by 2 is ur radius. Radius is 1.5. 3.14 times 1.5 square or 3.24 times 1.5 times 1.5 it will get ur final answer. ( I don't have my calculator with me so I gave u a direction only )