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=3,14×5(2×8+10)
=408,2CM²
s=√5²+12²
=√25+144
=√169
s=13cm
Lp kerucut=π×r(r+s)
=3,14×5(5+13)
=282,6
Lp kerucut+Lp tabung tanpa tutup
282,6+408,2
=690,8cm²