Question

5. A gardener wants to fence a circular garden of diameter 21 m. 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 4 per metre.
TC circumference of
thआंसर इस रॉन्ग ​

Answer 1

Answer:

Step-by-step explanation:

diameter of circular garden is 21m

NOW,

circumference =2πr

=22/7*21

=22*3

=66m

cost of wire is 4 per meter

Total cost of wire =66*4

=Rs264 ans.

Answer 2

Answer:

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