A decorative article is formed by placing a right circular cone on top of a solid…
MATHEMATICS · Subjective · CBSE · Mathematics · Surface Areas and Volumes · Surface Areas and Volumes
Problem
A decorative article is formed by placing a right circular cone on top of a solid hemisphere. The hemisphere has radius 7cm and the cone has the same base radius; the slant height of the cone is 25cm. The plane circular base of the hemisphere rests on a table and will not be covered.
(i) Calculate the total curved outer surface area of the article that will be silver-plated.
(ii) If silver-plating costs Rs 15 per square centimetre, find the total cost of plating, correct to the nearest rupee.