hitunglah Π22/7 dengan jari jari 7 cm

π = 22/7
r = 7 cm

luas
= π × r × r
= 22/7 × 7 cm × 7 cm
= 154 cm²

keliling
= 2 × π × r
= 2 × 22/7 × 7 cm
= 44 cm