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garis pelukis kerucut = s
s=√r²+t²
s=√5²+12²
s=√25+144
s=√169
s=13 cm
Lp=phi×r²+2×phi×r×t+phi×r×s
Lp=3,14×5²+2×3,14×5×8+3,14×5×13
Lp=78,5+251,2+204,1
Lp=533,8 cm²