Question

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 two rounds of fence also find the cost of the rope if it costs Rs 4per meter​

Answer 1

Answer :

• 528m would be cost to fence the garden

Given :

• Diameter 21m

To find :

• The length of rope
• Cost of the rope

Solution :

Now we have to find the radius,

• Diameter is 21m

》 Radius = Diameter/2

》 Radius = 21/2 m

As we know that,

• Circumference of circular garden = 2πr

》 2 × 22/7 × 21/2

》 22/7 × 21

》 22 × 3

》 66m

Now ,

• Length of rope required = circumference of garden

》 2 × 66

》 132m

Now we have to find the cost of rope

According to Question Given that,

• cost of one rope = Rs 4

》 Cost of 132m rope = 132 × 4 = 528

Hence , 528m would be cost to fence the garden

Answer 2

Given:-

• Diameter = 21m

To Find:-

• The length of the rope
• Cost of the rope

Solution:-

Now, we have to find the radius

We know that,

$\sf\red{Radius={\frac{Diameter}{2}}}$

•R = 21/2m

We know that,

• Circumference of circular garden = 2πr

•2 × 22/7 × 21/2

•22/7 × 21

•22 × 3

•66m

Now,

Length of rope required = Circumference of garden

•2 × 66

• 132m

Now,

We have to find the cost of rope

•Cost of one rope = Rs 4

•Cost of 132m rope = 132 × 4 = Rs 528

Hence, Cost of 132m rope is Rs 528.