tolongnya kerjakan besok kumplulan

nomor 1
r = 7 cm
luas = πr²
= 22/7 × 7 × 7
= 22 × 7
= 154 cm²

nomor 2
r = 10 cm
luas = πr²
= 3,14 × 10 × 10
= 314 cm²

nomor 3
r = 28 cm
luas = πr²
= 22/7 × 28 ×28
= 22 × 4 × 28
= 88 × 28
= 2.464 cm²

nomor 4
r = 36 cm
luas = πr²
= 3,14 × 36 × 36
= 4.069,44 cm²