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πr² * t = 6280
3,14 * 10² * t = 6280
3,14 * 100 * t = 6280
314t = 6280
t = 6280 / 314
t = 20 cm
= 3,14 . 10 . 10
= 314 cm³
V kerucut = L alas . t : 3
6280 = 314 . t : 3
t = 6280 . 3 :314
= 60
tinggi kerucut adalah 60cm