Answer:1256.63706 cm
Step-by-step explanation: The equation used to find the area of a circle is A=πr²
So you would input 20 in the place of r.
Making the equation π20²
input into a calculator the answer of π×20² is 1256.637061 cm
π20²≈1256.637061
without a calculator use 3.14 in place of π
3.14×20²=1256