A park is in the shape of a circle, a person walking on the boundary covers a distance of 440m in one round. Find the diameter of the park and also the cost of covering it with gravel at the rate of 25 per m^2
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5
Answer:
perimeter =440 m
formula of perimeter of circle is 2pir
2×22/7×x=440m
radius =70m
diameter =2r
diameter =2×70
140m
area of circle =pir²
22/7×70×70
15400m²
25×15400=385000
Answered by
3
Step-by-step explanation:
Circumference = 440m
πd = 440m
22/7 × d = 440
d = 440/22 × 7
d = 20 × 7
d = 140m
r = d/2 = 140/2 = 70m
Area = πr² = 22/7 × 70 × 70 = 15400m²
Cost of covering it with gravel = ₹25 per m²
Cost of covering 15400m² = ₹ ( 25 × 15400 )
= ₹ 385000
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