keliling dan luas daerah lingkaran berdiameter 12 cm

dik :
d = 12cm
maka, r = d/2 = 12/2 = 6cm

Keliling
= πd
= 3,14 x 12
= 37,68cm

Luas
= πr²
= 3,14 x 6²
= 113,04cm²

K = phi*d
=3,14*12 = 37.68
L = phi*r2
=3,14*6*6 = 113.04