kahn area of a circle

Question

Find the area of a circle with a circumference of 6.28 units.

Answer 1

Hello Mia,

The formula for the area of a circle is A = π*r²; r is the radius and π = 3.14

You're not given the radius, but you're given the circumference C: 6.28 units.

Also, there's a formula for C: C = 2*π*r so use that to solve for r ---> 6.28 = 2*3.14*r

so 6.28 = 6.28 * r ---> r = 1 unit

Plug r back into area formula: A = 3.14* (1)² = 3.14 units squared, or A = 3.14 units²