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Question 7:
What is the lateral surface area of a cone if its height is 2 times of the radius ?
Answer:

Question 8:
What is the radius of the base of a cone of height 6 cm and slant height 10 cm ?
Answer:
8 cm.

Multiple Choice Questions

Question 1:
Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Its curved
surface area is
(a) 163 cm 2
(b) 165 cm 2
(c) 156 cm 2
(d) none of these

Question 2:
Curved surface area of a cone is 308 cm and its slant height is 14 cm. Radius of the
2
base is
(a) 7 cm
(b) 14 cm
(c) 22 cm
(d) none of these

Question 3:
A Joker’s cap is in the form of a right circular cone of base radius 7 cm and height 24
cm. Find the area of the sheet required to make 10 such caps.
(a) 5500 cm 2
(b) 5050 cm 2
(c) 5005 cm 2
(d) none of these

Question 4:
The height of a cone is 16 cm and its base radius is 12 cm. Find its curved surface area.
(a) 753.16 cm 2
(b) 753.6 cm 2
(c) 753.61 cm 2
(d) none of these