Question

The cost of fencing a circular field at a rate of Rs.24 per meter is Rs .5280.The field is to be ploughed at the rate of Rs.0.50 per meter square. Find the cost of ploughing field.

Answer 1

Answer: 1705

Step-by-step explanation:

As per the cost of fencing, the circumference of circle = (5280/22)= 220m

now, 220= 2* pi*r   (r= radius)

 or, 220= 2* (22/7)* r

 or, r= 35m

area= pi* (r^2) = (22/7)*35*35= 1705*2

cost of ploughing = 0.5 per m sq.

total cost of ploughing = 1705*2*0.5 = 1705

Answer 2

Step-by-step explanation:

circumference of the circle = rs 5280÷ 24= 220 meter

we know 2πr = 220

so r = 220/2π

r = 35 m

area of the circle= πr2= 22/7 × 35×35 =3850 m2

so cost of ploughing field = 3850×0.5= RS 1925