the radius of a circular Garden is 70 m a 3.5 M Wide Road is built around its outside what will be the cost on the construction of the road if the rate of cost is rupees 20 per square metre.
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I hope u know diagram
The outer radius of path, R= 70m
Width of park =3.5m
The inner radius of path , r =70-3.5 =66.5
Area of path = Area of outer circle - area of inner circle
= Pi R square -pi r square
= Pi×70×70-Pi×66.5×66.5
=1501.5
Price of road construction= 20/square meter
=1501.5×20
=30030.
Hope u understood
The outer radius of path, R= 70m
Width of park =3.5m
The inner radius of path , r =70-3.5 =66.5
Area of path = Area of outer circle - area of inner circle
= Pi R square -pi r square
= Pi×70×70-Pi×66.5×66.5
=1501.5
Price of road construction= 20/square meter
=1501.5×20
=30030.
Hope u understood
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