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= 1/2 x 4 x 22/7 x 3,5 x 3,5
= 22 x 3,5
= 77 cm²
luas permukaan krucut
t = 15,5 - 3,5
= 12
Ls = phi x r x s
= 22/7 x 3,5 x 12,5
= 11 x 12,5
= 137,5
luas seluruhnya
Lp = 137,5 + 77
= 214,5 cm²