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S=√t2+r2
=12×12+5×5
=144+25
=√169
S=13
dit= L.permukaan?
jwb= Lp= L.alas+ L.tabung+ L.selimut kerucut
=Πr2×2Πrt×Πrs
=(22/7×5×5)+(2×22/7×5×18)+(22/7×5×13)
= 78,5+565,7+204,2
=848,4 cm2