luas bangun datar pada gambar lingkaran berdiameter 14 cm

r (Jari jari) = Diameter : 2
r = 14 : 2 = 7 cm
L Lingkaran = π×r²
L Lingkaran = 22/7 ×7 ×7
L Lingkaran = 22 × 7
L Lingkaran = 154 cm²

L= Phi × R × R
= 22/7 × 7 × 7
=154 CM2

D = 14 CM : 2 = 7 CM
JARI JARI = 7 CM