Question

A road 3.5m wide surround a circular park whose circumference is 176m.Find the cost of priving the road a rate of 60 per square.

Answer 1

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Let the 'r' and 'R' be the radii of the inner and outer circle respectively.

Circumference of the circle = 44 m

⇒2πr = 44

⇒2*22/7*r = 44

⇒r = (44*7)/44

⇒r = 7 m

» Radius of the inner circle is 7 m

Width of the road = 3.5 m

» Radius of the outer circle = 7 + 3.5 = 10.5 m

⚘ Area of the road = πR² - πr²

⇒ 22/7*10.5*10.5 - 22/7*7*7

⇒ 346.5 - 154

Area of the road = 192.5 sq m

Cost of paving the road = Rs. 50 per sq m

Total cost of paving the road = 192.5 × 50

⚘ Total cost = Rs. 9625 

Answer 2

Answer:

Step-by-step explanation:

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