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

[tex]l = \sqrt{ {r}^{2} } + {h}^{2} [/tex]

[tex] \: \: = \: \sqrt{ {21}^{2} + {20}^{2} } [/tex]

[tex] \: \: = \: \sqrt{ {441} + 400 } [/tex]

[tex] \: \: = \: \sqrt{881} [/tex]

[tex] \: \: = \: 29 \: m[/tex]

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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