Respuesta :

igoroleshko156

Answer:

40π

Step-by-step explanation:

Circumference Formula:  C = 2πr

Step 1:  Divide diameter by 2 to get the radius

40 / 2 = 20 m -> Radius

Step 2:  Plug into the Circumference Formula

C = 2π(20)

C = 40π

Answer:  40π

jcherry99

Answer:

Step-by-step explanation:

The radius of the circle is d/2

The Area of the circle is pi*r^2

The Area of the circle is pi * (d/2)^2

The Area of the circle is A = pi * (40/2)^2

The Area of the circle is A = 400 * pi

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