Respuesta :

Answer:

326.7

Step-by-step explanation:

Radius=1/2 of the diameter=10.2

Area of a circle= πR^2=3.14*(10.2)^2=104.04*3.14=326.6856=326.7

Answer:

64.056

Step-by-step explanation:

2*3.14*10.2(radius, half of the diameter)