Respuesta :

Answer:

A≈63.62

Step-by-step explanation:

A=πr2

d=2r

Solving forA

A=1 /4 x π x d^2

=1 /4 x π x 92 ≈ 63.61725

Answer:

=63.585

Step-by-step explanation:

A = π r²

9/2=4.5

4.5^2=20.25

20.25x3.14=63.585