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785 = ( π × r² ) × T
785 = ( 3.14 × 5²) × T
785 = 78,5 × T
T = 785/78,5
T = 10 cm
r = 5 cm
t = ......?
jawab :
Vt = 1/3 .TT . r² . t
785 = 1/3 . 3,14 . 5 . 5 . t
785 = 1/3 . 3,14 . 25 . t
785 = 1/3 . 78,5 . t
785/78,5 = 1/3 t
10 = 1/3 t
t = 3/1 . 10
t = 30