The radius of a circular garder is 56 m. What is the cost of four round fence around this garden at the rate of `$`40 per metre ?

Explanation

The circumference (c) of the circular garden = `2pir = 2xx22/7xx56=352m`.
`therefore` the langht of the wire required for one round of fencing = 352 m .
`therefore` the lenght of wire required for four rounds of fencing = `352xx4=1408m.
The cost of 1408 m of wire= `"rate" xx "lenght"` of the wire=`$ 40 xx 1408=$56,320`
The cost is `$`56,320.