Question

Diameter = 21 inches
Circumference
Area

Answer 1

Circumference: 65.9734 inches

Area: 346.361 square inches

Explanation:

If the diameter is 21 inches, we know the radius, r, is 10.5 inches because the radius measure is half of the diameter.

Circumference Formula: 2πr

=2π(10.5)

=65.9734 inches

Area formula: π
`r^(2)`

π(10.5)^2

= 346.361 square inches

Answer 2

Radius: 10.5

Circumeference: 65.97

Area: 346.36

Explanation: