Answer the following questions about composite solids without performing any…
MATHEMATICS · Multi-part · CBSE · Mathematics · Surface Areas and Volumes · Surface Areas and Volumes
Problem
Answer the following questions about composite solids without performing any numerical calculations.
(i) Explain why the plane face that joins two solids is generally not counted while calculating the total outer surface area of the composite solid.
(ii) A hemisphere is placed exactly on the circular top of a right circular cylinder having the same radius. List the surfaces that will be exposed after joining and state which surface(s) become hidden.
(iii) How would your answer to part (ii) change if the cylinder is open at the top before the hemisphere is placed? Give reasons for your answer.