Question

A gardener wants to fence a circular garden of diameter 21m find the length of the rope he needs to purchas if he makes2 round of fence . Also find the cost of the rope if it costs 4 per meater

Answer 1

The length of the rope is 132 and its total cost is Rs 528.

Answer 2

Answer:

$\fbox \pink{diameter} = 21m \\ \\ \fbox \purple{radius} = \frac{21}{2}m \\ \\ \fbox \red{circumference} = 2\pi \: r \\ \\ 2 \times \frac{22}{7} \times \frac{21}{2} = \frac{22}{7} \times 21 \\ \\ 22 \times 3 = 66m \\ \\ \fbox \green{length \: of \: rope \: required} = 2 \times 66 = 132m \\ \\ \fbox \blue{cost} = 1m \: rope = 4 \\ \\ 132m \: rope = 4 \times 132 = 528</p><p></p><p>$