Question

A heap of rice is in the form of of a cone of base diameter24m and height 3.5m. Find the volume of the rice . How much canvas cloth is required to just cover the heap?

Answer 1

diameter=24

radius=d/2=24/2=12

height=3.5

$volume \: of \: cone \: = \frac{1}{3} \pi {r}^{2} h$

$\frac{1}{3} \times \frac{22}{7} \times 12 \times 12 \times 3.5$

$= 528 {m}^{2}$

area of cone =528

Answer 2

Answer:

Cone :-

Radius=12cm

Height=7/2cm            (easy for calculation)

Volume of rice = volume of cone              l = √r² + h²

= 1/3$\pi$r²h                                        = 144 + 49/4

=1/3 * 22/7 12*12 * 7/2                                     = (576 + 49)/4

528 cm³                                                 = 625/4

                                                   √625/4= 25/2cm

Area of canvas covered= CSA of cone

=$\pi$rl

22/7*12*25/2

=471.42cm²

Hence. proved.