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140 = 22/7 . 14 . 14 . t
140 = 22 .2 . 14 . t
140 = 616 . t
t = 616/140
t = 22/7 cm
L.permukaan = 2.π . r (r + t)
= 2 . 22/7 . 14 (14 + 22/7)
= 2 . 22 . 2 ( 120/7)
= 88 .(120/7)
= 10560 / 7
= 1508,57 cm²
phi x r^2 x t = volum
22/7 x 14^2 x t = 140
22 .2 . 14 . t = 140
616 . t = 140
t = 140/616
t = 5/22 cm
L.permukaan = 2 x π x r (r + t)
= 2 x 22/7 x 14 (14 + 5/22)
= 2 x 22 x 2 ( 313/22)
= 88 (313/22)
= 4(313)
= 1252 cm^2