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Asked by Hamdaan Last Modified
Answer 
Gautam Pal
Maths Teacher for classes 6th to 10th with 6 years experience and having my own YouTube Channel for clearing doubts
Diameter of the cone = 10.5m (Radius of the cone = 5.25m)
Height of the cone = 3m
Volume of the cone = (πr²h)/3
∴ Volume of the cone = (π x 5.25² x 3)/3 = 86.625m³
The heap is to be covered by canvas to protect it from rain and we have to find the area of the canvas required. So, that means, we have to find the lateral surface area.
Lateral surface area of the cone = πr√r² + h²
∴ Lateral surface area of the cone = π x 5.25√5.25² + 3² = 99.77m²
∴ The area of the canvas required = 99.77m²
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Aniruddh Dhariwal
Professional in Adaptive Learning for 8-12th with 11 Yrs of Experience in Quality Teaching
V = (1/3)*π*r*r*h
r =10.5/2= 5.25
V= (1/3)*(22/7)*5.25*5.25*3
= 86.625 m^3
Area of the canvas = curved surface of heap = π*r*l
l = √(r*r+h*h) = √(36.5625)
=6.046 m (approx)
πrl = 3.14*5.25*6.046
= 99.668 m^2
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Related Questions
Find the volume of the right circular cone with
(i) radius 6 cm, height 7 cm
(ii) radius 3.5 cm, height 12 cm
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