keliling sebuah roda 314 tentukan luas roda tersebut jika phi 3,14

k=phixd
314=3,14xd
d=314/3,14=100 cm
r=1/2d=50 cm
luas=phixr^2
=3,14x50^2
=3,14x2500
=7850cm^2

Keliling = π x D
Luas = π x r²

Cari diameter dulu
K = π x D
D = K/π
314 = 3,14 x D
D = 314/3,14
= 100 cm

Terus, cari luas
L = π x r²
r = 1/2 x D
r = 1/2 x 100 cm
= 50 cm
L = π x 50²
= 3,14 x 2500
L = 7850 cm²