Tentukan luas permukaan bola yang berdiameter 14cm

d = 14 cm
r = 7 cm

Lp = 4 × π × r²
= 4 × 22/7 × 7 × 7
= 616 cm²

lp bola = 4× luas lingkaran
= 4×pi× r^2
= 4 × 22/7×7×7
= 4×22×7
=616 cm^2

note = ^2
=2 kuadrat