Question

The cost of levelling a square lawn at rupees 15 per square metre is rupees 19,935.find the cost of fencing the lawn at rupees 22 per metre .​

Answer 1

Area of square lawn

$= \frac{19935}{15} \\ \\ = 1329 \: {m}^{2}$

${a}^{2} = 1329 \\ \\ \: a = 36.45 \: m$

Perimeter of lawn

= 4 a

= 4 × 36.45

= 145.8 m

Cost of fencing

= 22 × 145.8

= 3207.6 rupees.

Answer 2

$\textbf{Question}$

The cost of levelling a square lawn at rupees 15 per square metre is rupees 19,935.find the cost of fencing the lawn at rupees 22 per metre .

$\textbf{Solution}$

Area of square lawn

$= \frac{19935}{15}$

$= 1329 \: {m}^{2}$

As we know that

area of square

$= {a}^{2}$

$= {a}^{2} = 1329$

$= a \: = \sqrt{1329}$

= a = 39.45 m

Now ,

Perimeter of lawn = 4a

= 4 × 39.45

= 145.8 m

Cost of fencing = 22 × 145.8

= 3207.8 rupees