gimana Cara yang paling atas ITU???

Dik: jarai2 (r) = 35 cm
luas = pi × r × r = 22/7 × 35 × 35 =3.850 cm^2

dik: r = 5cm
luas = pi × r × r = 3,14 × 5 × 5 = 78,5 cm^2

dik: d = 21 cm
keliling = pi × d = 22/7 × 21 = 66 cm