​Explain how to get the area of a circle with a circumference of 8.5cm

Circumference=Pi x Diameter(Radius x 2)

8.5=3.141592 x D

D=8.5 / 3.141592

D=2.706 cm

Radius=2.706 / 2=1.353cm

Area=Radius^2 x Pi

A=1.353^2 x 3.141592

A=5.751 cm^2  area of the circle.

8.5/π=diameter

area = π(8.5/2π)^2= 5.749cm²