CBSE Class 10-Mathematics: Chapter –13 Surface Areas and Volumes Part 12
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Question 21:
The height of a right circular cone is and the radius of its base is . Find its slant height.
Answer:
Slant height
Question 22:
How many balls, each of radius 1cm, can be made from a solid sphere of lead of radius .
Answer:
Number of balls
Question 23:
A drinking glass is in the shape of a frustum of a cone of height . The diameter of its two circular ends are and m. Find the capacity of the glass.
Answer:
Capacity of glass
Question 24:
The diameter of a sphere is . It is melted and drawn into a wire of diameter . What is the length of wire?
Answer:
Radius of sphere
Volume of sphere
Let length of the wire R= Radius of the wire Volume of wire
Question 25:
An iron pipe long has exterior diameter equal to . If the thickness of the pipe is . Find the whole surface area of the pipe.
Answer:
Total surface area of pipe
Question 26:
Find the ratio of the volumes of two circular cones. If .
Answer:
Ratio of volumes of two cones