Can someone plzz describe this set

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

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Write the equation in logarithmic form e^x=403.429