Question

a garden want to fence a circular garden of diameter21m find the leanth of the rope he needs to purchas,if he makes 2 round of fence Also find the cost of the rope, if its cost rupees 4 per meter.(take pi 22by 7​

Answer 1

Answer:

The cost for double fencing the garden is ₹538.00

Step-by-step explanation:

To find the cost, we need the perimeter and the rate.

P(circle)=π*d

P(garden)=(22/7)*21

P(garden)=22*3

P(garden)=66 m

Cost(fencing)=rate*perimeter

Cost(fencing)=4*66

Cost(fencing)=₹264.00

But, as the fencing is done 2 times, the total cost is 2x original cost.

Total Cost=2*Cost(fencing)

Total Cost=2*264

Total Cost=₹528.00

Answer 2

Answer:

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