Question

let us write by calculating that how much length of wall in meter is required for walling outside round the square field, whereas the length of diagonal of the square land is 20 root 2 meter. Let us write by calculating how much cost will be for planting grass at the rate of Rs.20 per sq. meter​

Answer 1

length of the diagonal is equal to 20 root 2

a root 2 =diagonal

a root 2 =20 root 2

diameter is equal to 20 *4 =80 square metre

area equal to 20 * 20 is equal to 400

cost =400*20

=8000

answer: cost of planting grass is equal to 8000

Answer 2

$\huge\mathcal{\pink{A}}\huge\mathcal{\purple{N}}\huge\mathcal{\green{S}}\huge\mathcal{\blue{W}}\huge\mathcal{\red{E}}\huge\mathcal{R}$

We know, that the length of diagonal of square = L√2 units, where L is the side of square

Diagonal of the square = 20√2m

On comparing,

side of the square land = 20m

Also, we know

Area of square = (side)²

Area of the square land = 20²= 400m²

Cost for 1 m² to plant grass = Rs. 20

Cost for 400m² to plant grass = Rs. 20 × 400 = Rs. 8000