Tolong bantu ya kak :)

A) K = 2 x 22/7 x 21
= 44 x 3
= 132 cm

b) K = 2 x 3,14 x 20
= 3,14 x 40
= 125,6 cm

c) K = 22/7 x 56 = 22 x 8 = 176 cm

d) K = 3,14 x 36 = 113,04 cm

e) K = 22/7 x 84 = 22 x 12 = 264 cm

f) K = 3,14 x 60 = 188,4 cm