Question

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? text???--​

Answer 1

Refer attached Image for step by step answer ...

*next post the question on maths not Chinese

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Answer 2

outer circle area = πr^2

(pond + footpath) = 22/7 ×77 × 77

= 22×11×77

= 18634 sq. m

inner circle area = πr^2

(pond) = 22/7 ×70×70

= 22×10×70

=15400 sq. m

area of footpath = 18634-15400

= 3234 sq. m

total cost of leveling = area of footpath × cost

= 3234 × 15

= 48510$

Therefore the total cost of leveling footpath is $ 48510

Hope it helps.... ...