the diameter of a circular garden is 140 m . on its outside there is a road 7 m wide . find the outer circumference of the road
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Radius of circle = 140/2=70M
Area of circle = πr^2 = 22/7×70×70
============= =====15400sq M
Radius including road = 70+7=77
Area ......................= πr^2 = 22/7×77×77
====================== 18634 sq M
Area of Road (leveling)=18634-15400
===================== 3234 sq M
Cost of leveling road = 3234×1.5
= 4851 rupees
Answer ----4851
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Answer:
given diameter of a circle is 140m
radius of a circle =d/2
=140/2
=70
circumference of a circle= 2pieR
radius of a inner circle is 70m
radius of a outer circle is 70m+7m
=77m
circumference of a circle is 2×22/7×77
=484m
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