Question

a gardener wants to fence a circular garden of diameter 21 metre find the length of the Rope used to purchase if he makes two rounds of the fence also find the cost of the wrong if it cost 4rupees for per metre ​

Answer 1

Answer:

diameter of garden=21m

radius=10.5m

circumference of circle=rope required to fence

circumference=

$2\pi \: r = 66m^{2}$

according to question,

twice the rope is fenced=

$2(66) = 132m {}^{2}$

cost of fencing=

$4 \times 132m {}^{2} = 528rupees$

Answer 2

Answer:

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