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Nomor 4

C

Nomor 5

r = 35

kll = 2 π r

kll = 2 . 22/7 . 35

kll = 2 . 22 . 5

kll = 44 . 5

kll = 220 cm

Nomor 6

kll = 2 π r

88 = 2 . 22/7 r

88 . 7/22 = 2r

4 . 7 = 2 r

28 = 2r

28/2 = r

14 = r