The radius of the base of a solid right circular cone is 8 cm and its height is 15 cm. The total surface area of the cone is:
Answer & explanation
Correct answer: option 2
We know that,
l2 = r2 + h2
Total surface area of cone = πr (l + r)
We have, r = 8 cm
h = 15 cm
According to the question,
l2 = 82 + 152
l2 = 64 + 225
l2 = 289
l = 17
Total surface area of cone = π × 8 × (17 + 8) = π × 8 × 25 = 200 π