The diameter of a circular garden is 84 m. On its outside,there is around 3.5 m wide. Find the cost of constructing the road at Rs 20 per square meter.

Asked by Upal36745 | 3rd Jan, 2019, 09:29: PM

Expert Answer:

 
The diameter of a circular garden is 84 m. On its outside,there is around 3.5 m wide. Find the cost of constructing the road at Rs 20 per square meter.


Here, radius of a circular garden = 84 ÷ 2 = 42 m
Area of the circular garden = begin mathsize 16px style straight pi end styler2 = 22/7 × 42 × 42 = 5544 m2
Width of the road = 3.5 m
 
radius = 42 + 3.5 = 45.5 m
 
Total area = begin mathsize 16px style straight pi end styler2 = 22/7 × 45.5 × 45.5 = 6506.5 m2
Area of the road = 6506.5 - 5544 = 962.5 m2
The cost of constructing the road at Rs.20 per square meter = 962.5 × 20 =Rs. 19250

Answered by Yasmeen Khan | 4th Jan, 2019, 04:20: PM