Question

11) The radius of a circular park is 63 m. Find the cost of fencing it at Rs. 12 per meter.
(A) Rs. 4,752
(B) Rs. 7,452
(C) Rs. 4,572
(D) Rs. 4,672​

Answer 1

Radius of circular park = 63 m.

Circumference = 2*π*radius

= 2*22/7*63

= 44*9

= 396 m.

Now,

Rate of fencing the circumference of the circular park = Re.12 per metre

So,

the cost of fencing = Circumference*Rate

= 396 * 12

= Re.4752.

Hope this helps...

Answer 2

Answer:

(A) Rs. 4,752

The cost of fencing is Rs. 4,752

Step-by-step explanation:

Given:

• The radius of a circular park = 63 m

• Rate = Rs. 12 per meter

To Find:

• The cost of fencing

Solution :

⇒ Radius (r) = 63 m

★ Find the Circumference:

Circumference of the circle = 2 π r

⇒ 2 × 22 / 7 × 63

⇒ 44 / 7 × 63

⇒ 44 × 9

⇒ 396 m

Circumference of the circle = 396m

____________________________

★ Find the cost of fencing:

Circumference × Rate

⇒ 396 × 12

⇒ 4,752

Therefore,

(A) Rs. 4,752

The cost of fencing is Rs. 4,752