Question

The radius of circular field is 7cm. Find the cost of fencing in it at the rate of 60 paise per meter
1. Rs.64.4
2. Rs. 26.4
3. Rs.92.2
4. Rs.90

Answer 1

Correct Answer - Option 2 : Rs. 26.4

Given

Radius of circular field = 7cm

Rate of fencing = 60 paise/ meter

Formula used

Circumcentre of circle = 2πr

Calculation

Circumcentre of circle = 2πr

⇒ (22/7) × 2 × 7

⇒ 44 cm

⇒ cost = circumcentre × rate

⇒ 44 × 60/100

⇒ 26.4

⇒ Rs. 26.4