NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.3 – Part 1
Q-1 Diameter of the base of a cone is and its slant height is . Find its curved surface area.Solution:
Cone has a slant height s which is given as (because of Pythagoras theorem).
Here, cone radius (r) and slant height (l) . Therefore, curved surface area of the cone
Q-2 Find the total surface area of a cone, if its slant height is and diameter of its base is .Solution:
Slant height (l)
Total surface area of the cone
Q-3 Curved surface area of a cone is and its slant height is . Find
Radius of the base and
Total surface area of the cone.
Curved surface of a cone and slant height (l)
Therefore, total surface area of the cone