A circular pond had the radius 70m. 7m wide foothpath runs around it find the area of the foothpath. what will be the cost of leveling the foothpath at $ 15per sq m? evening guys...
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Answer:
GIVEN :-
Radius of circular pond ( r ) = 70 m.
Width of footpath ( w ) = 7 m.
TO FIND :-
The area of footpath.
SOLUTION :-
Let the radius of circular pond be "r" and the radius of outer circle ( bigger circle ) be "R".
➳ R = r + w
➳ R = 70m + 7m
➳ R = 77m.
Now,
➳ Area of footpath = πR² - πr²
➳ Area of footpath = 22/7 × (77)² - 22/7 × (70)²
➳ Area of footpath = 22 × 77 × 11 - 22 × 70 × 10
➳ Area of footpath = 18634 - 15400
➳ Area of footpath = 3234m²
Now,
➳ Total cost of levelling = Area × Rate
➳ Total cost of levelling = 3234 × 15
➳ Total cost of levelling = Rs. 48510
Hence Total cost of levelling the footpath = Rs. 48510.
Explanation:
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