Question 1198765
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Circle Area formula
A = pi*r^2


The garden, minus the path, has a diameter of 38 yards.
Half of which is 38/2 = 19 yards. 
This is the radius of the smaller inner circle.


Let's compute the area of this circle
A = pi*r^2
A = pi*19^2
A = pi*361
A = 361pi


The path around the garden is 5 yards in width.
This will add 5 to the radius we found earlier.
19+5 = 24
The outer concentric circle has a radius of 24 yards.


The larger circle has an area of:
A = pi*r^2
A = pi*24^2
A = pi*576
A = 576pi


Now compute the difference of these items to find the area of the garden path only (i.e the outer ring).
576pi - 361pi = (576-361)pi = 215pi


The exact area of the path only is 215pi square yards.
This is approximately 
215*3.1415926535898 = 675.442420521807 square yards.


x = number of bags of sand needed
1 bag covers 7 square yards
x bags cover 7x square yards
7x = 675.442420521807
x = 675.442420521807/7
x = 96.4917743602581
Round that up to the nearest integer to get x = 97


Answer: 97 bags of sand are needed.
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