Question

Buat kaka yg hebat matematika tolong dibantu yah kak. no spam please. Thankyou.

Answer 1

Kalau mnurut saya
luas A = 4Πr²
kalau r = 5
maka Luas A
4Π5²
=100 Π cm²
semoga membantu

Answer 2

luas A = 4.phi.r^2
f(r) = 4.phi.r^2
f(5) = 4.3,14.5^2
      = 3,14 . 100
      = 314 cm^2