The formula for a circumference of a circle is: C=2πr and we are given the answer as C=16π
Therefore we know that 16 is from the combination of multiplying 2 and r So to find r we do the opposite of what is done. The opposite of multiplying is dividing, therefore: 16/2=8 therefore r = 8
The formula for the area of a circle is: A=πr^2 Since we know r = 8 we just sub it into the equation
A=π*8^2 A=64π or (assuming you want π to two decimal places: 3.14 then) 200.96
