The edge of a round pond is 132 m long. Find the radius of the pond and the area of its surface…

The circumference is $C = 2\pi r = \pi d$ and the area is $A = \pi r^2$. Use $\pi = \dfrac{22}{7}$ only when the question says so. Change all lengths to one unit first, and remember $1\ \text{m}^2 = 10\,000\ \text{cm}^2$.