The area of a circle is 1386 cm2. What is its circumference?

Question

You have a patch of dead shrubs you want replaced with sod. But there's a hornet's nest in the middle, and therefore to avoid
getting stung you can't measure the radius or diameter to plug into the formula: area = pi r squared.

And in order to get a price quote from the landscaper you need the square footage.

You can however easily measure the circumference.

Question: what is the area of this circle of dead shrubs if the circumference is 100 ft?

Answer 1

πr^2 = 1386 cm^2
r^2 = 1386/π = 441.1775 cm^2
r = 21 cm
Circumference = 2πr = 132 cm.