Question

A Gardner wants to fence a circular garden of diameter 21 m. Find the length of the rope he need to purchase, if he makes 2 round of fence. Also find the cost of the rope, if it cost rupee 4 per meter ( Take π = 22/7
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Answer 1

⇒Given:-

• Diameter of circular garden =21 m
• Rate of rope =₹4 /m

⇒To find out:-

• Length of rope if he makes 2 rounds of circular garden
• To cost of rope

⇒Formula used:-

• Circumference of circle =2πr

⇒Solution:-

Diameter of circular garden =21 m

Radius of circular garden =21/2 m

Circumference of circular garden =2×22/7×21/2

Circumference of circular garden = 66 m

A/q

He makes 2 round of garden

Thus total length =66×2 m= 132 m

➠Total cost at the rate of ₹4 /m =132×4= ₹528

Answer 2

Answer:

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