Question

A gardener wants to fence a circular garden of diameter 21m.Find the length of the rope he need to purchase,if he makes 2 rounds of fence.Also find the cost of the rope, if it costs ₹ 4 per meter. ( Take

Answer 1

Answer:

132m, 528 rs

Step-by-step explanation:

length of rope = circumference of garden

= 2 x 22/7 x 21/2 = 66m

required amount = twicw perimeter = 2 x 66m = 132m

cost = 4 x 132m= 528 rs

Answer 2

Answer:

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