What is the area of the curved surface of a right circular cone with height 8 m and slant height 10 m ?
Answer & explanation
Correct answer: option 2
We know that,
CSA = πrl
l2 = h2 + r2
l = 10 cm
h = 8 cm
According to the question,
= r2 + 82 = 102
= r2 = 100 – 64 = 36
= r = 6
CSA = πrl = π × 6 × 10 = 60π m2