Question

Qno 46. A gardener wants to fence a
circular garden of diameter 21m . Find
the length of the rope he needs to
purchase , if he makes 2 rounds of
fence. Also find the cost of the rope,
if it costs 5 per meter.(Take it
=22/7)​

Answer 1

Answer:

132 m, ₹660.

Step-by-step explanation:

Diameter of Circle Garden= 21 m

Therefore Radius= 21/2 m.

Length of Rope required to fence once= Circumference of Circle Garden

Circumference:

= 2*22/7*21/2

= 22/7*21

= 22* 3= 66 m.

To fence twice, length of rope required= 66*2= 132 m.

Rate of Rope= 5/m.

Cost required to fence twice= 132*5= ₹660

Answer 2

Answer:

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