Circumference of a circle formula: c=2πr where
c = circumference
r = radius
So here, we have c= 10π.
Divide 10 by 2 and we get a radius of 5; c=2π(5).
Area of a circle formula: a = πr² where
a = area
r = radius
Plug in 5 for radius.
a = (5²)π
a = 25π
a ≈ 78.5398