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s = akar dari 625
s = 25 cm
Luas selimut kerucut = pi × r × s
= 22/7 × 7 × 25 = 550 cm^2
Luas tepi topi = pi x R^2 - pi × r^2
= 22/7 × 10,5^2 - 22/7 × 7^2
= 346,5 - 154 = 192,5 cm^2
Luas total untuk pembuatan topi
= 550 + 192,5 = 742,5 cm^2 (C)