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jadi luas permukaannya = 1570
314 = 3,14 . r . 5
314 = 15,7 r
314/15,7 = r
20 = r
L.permukaan kerucut = 3,14 . r ( r + s )
LPk = 3,14 . 20 ( 20+5)
LPk = 62,8 ( 25 )
LPk = 1570 cm kuadrat