Question

the area of the square field,its perimeter

Answer 1

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Check out my answer in the attachment given...
NB --- Area of a square = Side * Side
Perimeter = 4* Side

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Answer 2

Total  cost = Rs 4800

cost on one meter = Rs 12

Area =$\frac{total cost}{cost on one meter}$

Area = 400sq. m.

length of one side = $s^{2}$

                               = $\sqrt[]{400}$

                               = 20 m

Perimeter = 4*s

                 = 4*20

                 = 80m