Question

the radius of a circular field is 210 m. the cost of fencing its circumference at the rate of rupees 1.25 per meter is

Answer 1

$radius = 210m \\ circumference \: of \: a \: circular \: field = 2\pi \: r \\ = 2 \times \frac{22}{7} \times 210 \\ = 2 \times 22 \times 30 \\ = 1320m \\ therefore \\ cost \: of \: fencing = 1320 \times 1.25 \\ = rs.1650$

Answer 2

Answer:

radius=210

circumference of a circular field=2πr

=2×22/7×210

=2×22×30

=1320

therefore cost of fencing=1320×1.25

=rs.1650