Question

A cone shaped cloud of wheat has a diameter of 42 meters and a height of 20 meters. If you want to cover it with plastic to protect it from rain, find the area of ​​plastic Also find the price at Rs. 5 / m².​

Answer 1

Answer:

diameter of cone shaped cloud of wheat = 42 metres

so, the radius = diameter/2 = 42/2 = 21 metres

height. of cone shaped cloud of wheat = 20 metres

$l = \sqrt{ {r}^{2} } + {h}^{2}$

$\: \: = \: \sqrt{ {21}^{2} + {20}^{2} }$

$\: \: = \: \sqrt{ {441} + 400 }$

$\: \: = \: \sqrt{881}$

$\: \: = \: 29 \: m$

Area of plastic = 22/7 × 21 × 29

= 22 × 3 × 29

= 1914 m²

Cost of plastic per m² = Rs. 5

Cost of plastic of 1914 m² = 1914 × 5 = Rs. 9570

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