Question

Gardner wants to fans a circular garden of diameter 21 m find the length of rope he needs to purchase if he makes two rounds of friends also find the cost of rope if it costs 4 per metre take paye is equals to 22 by 7

Answer 1

here's ur answer...

diameter=21m

radius=21/2=10.5m

circumference of garden=2πr

=2×22/7×10.5

=44/7×10.5

=462/7

=66m

if he makes two rounds then he have to purchase=66×2=132m

total cost=4×132

=₹528

hope this helps....

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Answer 2

Answer:

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