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t=4 cm
luas permukaan=??
luas permukaan kerucut: \pi r (r+s)
= 3,14 x 4 cm (4 cm+12)
= 12.56 cm x 16 cm
= 75,36 cm
s==5cm
l= +rs
l=(3,14×3×3)+(3,14×3×5)
l=28,26+47,1=75,36cm