Tolong bantuin yang no 4 ya yang B sama D aja .. makasiiiiii

B. 440 = 22/7 x r^2
r^2 = 7/22 x 440
r^2 = 140
r = √140
= 2√35 cm

D. 88 = 22/7 x r^2
r^2 = 7/22 x 88
r^2 = 28
r = √28
= 2√7 cm