Question

for which solid figure is the total surface area same as its CSA

(a0 right circular cone (b) sphere

(c) right circular cylinder (d) hemisphere

Answer 1

Correct answer is (B) Sphere

Because...
when we calculate CSA of cylinder or hemisphere of cone we don't include base area ..but when we calculate CSA of sphere we have to cover the hole surface area as it doesn't have any base.

hope this will help u.... :-)