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100π = 1/3 π 5² t
100 = 1/3 5× 5 t
100÷ 1/3 25 = t
12 cm = tinggi
100 = 1/3pii . 5^2 . t
100pii / 1/3pii = 25 . t
300 = 25t
t = 300/25
t = 12