tolong jawab yaa plis banget

luas=3,14x20x20=1,256

nomer 6
r = 21
L = pi x r^2
22/7 x 21 x21
22 x 3 x 21 =1386

nomer7
r = 20
L = 3,14 x 20 x 20 = 1256
jika belum jelas tanyakan aja