diameter 14cm berapa luas lingkarannya

r = d:2 = 14cm:2 = 7cm
L lingk= π × r^2 = 22/7 × 7 cm × 7 cm = 154 cm^2

d = 14 cm

L lingkaran
= 1/4 × phi × d^2
= 1/4 × 22/7 × 14 × 14
= 154 cm^2