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luas alas=∛volume/alas
rumus v = luas alas . t
masukin aja yg di ketahui misal vol, sama tinggi nya sama phi nya .,,.
v = 22/7 . r^2 . t
pindah ruas
hasil nya di akar = x
luas alas
22/7 . tadi yang di cari r nya
22/7 . r . r
dong nggak? gomen kalo ga jelas