Tolong dong!!! pakai cara ya! hari senin di kumpul.

42:2 =21
diameter =42
jari jari = 21

luas lingkaran : π×r×r
22/7 × 21× 21 = 1386

1/4 × 1386 = 346.5

1386 - 346.5 = B 1.039,5

22/7. 21. 21 =1386
1/4. 1386 = 346.5