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= 3,14 × 10 × (12+8)
= 628 cm²
L selimut kerucut kecil (atas) = phi × r × s
= 3,14 × 5 × 8
= 125,6 cm²
L lingkaran atas = phi × r²
= 3,14 × 5 × 5
= 78,5 cm²
Luas kap lampu = (L selimut kerucut besar - L selimut kerucut kecil) + L lingkaran atas
= (628 - 125,6) + 78,5
= 502,4 + 78,5
= 580,9 cm²