A right circular cone of radius 9 cm and height 12 cm is cut parallel to the base , to form two pieces such that the height of smaller cone is half of the height of the frustum. What is the curved surface area, in square cm , of the frustum ?
1) 60π
2) 72π
3) 90π
4) 104π
5) 120π
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Originally posted by
Ritace on 12 Mar 2018, 22:34.
Last edited by
Bunuel on 12 Mar 2018, 23:52, edited 1 time in total.
Renamed the topic, edited the question and added the OA.