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# A Heap of Wheat is in the Form of a Cone of Diameter 9 M and Height 3.5 M. Find Its Volume. How Much Canvas Cloth is Required to Just Cover the Heap? (Use 𝜋 = 3.14). - CBSE Class 9 - Mathematics

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ConceptSurface Area of a Right Circular Cone

#### Questions

A heap of wheat is in the form of a cone of diameter 9 m and height 3.5 m. Find its volume. How much canvas cloth is required to just cover the heap? (Use 𝜋 = 3.14).

Find the weight of a solid cone whose base is of diameter 14 cm and vertical height 51 cm, supposing the material of which it is made weighs 10 grams per cubic cm.

#### Solution 1

Given diameter of cone 14cm

∴ Radius of cone=7cm

Height of cone =51cm

∴ Volume of cone=1/3xxpir^2h

=1/3xx22/7xx7xx5xx51

= 2618 cm^3

It is given that 1cm^3 weight 10gm

∴ 2618cm^3 weight (261xx10) gm

i.e, 26.180kg.

#### Solution 2

To find the weight of the cone we first need to find its volume.

The formula of the volume of a cone with base radius ‘r’ and vertical height ‘h’ is given as

Volume of cone = 1/3 pi r^2h

Here, the diameter is given as 14 cm. From this we get the base radius as r = 7 m.

Substituting the values of r = 7 cm and h = 51 cm in the above equation and using  pi=22/7

Volume =  ((22)(7)(7)(51))/((3)(7))

= (22) (7) (17)

= 2618

Hence the volume of the given cone with the specified dimensions is 2618 m3

Now, it is given that material of which the cone is made up of weighs 10 grams per cubic meter.

Hence the entire weight of the cone = (Volume of the cone) (10)

= (2618) (10)

= 26180 gram

Hence the weight of the cone is  26.18 kg

Is there an error in this question or solution?

#### APPEARS IN

RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 20: Surface Areas and Volume of A Right Circular Cone
Ex.20.20 | Q: 10 | Page no. 21
Solution A Heap of Wheat is in the Form of a Cone of Diameter 9 M and Height 3.5 M. Find Its Volume. How Much Canvas Cloth is Required to Just Cover the Heap? (Use 𝜋 = 3.14). Concept: Surface Area of a Right Circular Cone.
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