Question

The diameter of a flowerbed in a garden is 2.8m Find the cost of fencing it at a rate of RS 55per m.

Answer 1

$\text{ Diameter = 2.8 m}\\ \\ \text{Perimeter =} \: \pi D = \frac{22}{7} \times 2.8 = 8.8\ m\\ \\ \text{Rate of fencing = Rs. 55 per m}\\ \\ \text{Total cost = } 55 \times 8.8=\ Rs.\ 484$

Answer 2

According to the Question

Diameter of garden = 2.8

Radius of the garden  

$\bf\huge R = \frac{2.8}{2}$

R = 1.4 m

Perimeter of the garden = 2πr

$\bf\huge = 2\times \frac{22}{7} \times 1.4$

= 8.8 Metre

Therefore

Cost of fencing = Perimeter × Rate  

= 8.8 × 55

= ₹ 484