Question

a gardener want to fence a circular gardener of diameter 21m, find the length of the rope he needs to purchase if he makes 2round s of fence, also find the cost of rope if it cost4permeter, (take22/7)​

Answer 1

The diameter = 21 m

the radius = 10.5 m

The circumference of circular garden

=2πr

=2× 22/ 7 × 10.5

= 66m

After fencing it two times

2 × 66m

= 132m Ans

The cost it took

: 1m = ₹ 4

:132m = ₹ 4 × 132

= ₹528

Answer 2

Answer:

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