Question

A heap of wheart is in the form of a
cone whose diameter is 42m and
height is 20m. The heap is to be covered
by convas to protect it form rain. If the
price of canvas is rs 5 per m^2
find
the cost of the canvas required, .​

Answer 1

Answer:

Given:

⇒Diameter =10.5 m

⇒radius =r =5.25 m

⇒height =3 m

⇒volume =

3

1

πr

2

h

⇒Volume=(

3

1

×

7

22

×5.25×5.25×3) m

3

⇒Volume=86.625m

3

For slant height:

⇒l

2

=h

2

+r

2

=3

2

+(5.25)

2

=9+27.5625=36.5625

⇒6.0467 m(approx)

Canvas needed to protect wheat from rain

Therefore, curved surface area=πrl

=(227×5.25×6.0467) m

2

=99.77 m

2

(approx)