When you say the circle is 115-ft "wide", we have to assume that
you're talking about the circle's diameter.
Area of a circle = (pi) x (R2)
R = radius = 1/2 of the diameter
1 acre = 43,560 square feet
Area of circle with 115-ft diameter = (pi) x (57.5)2 square feet = 0.2385 acre (rounded)
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23 times (115 ÷ 5 = 23).
To calculate how many times 5 goes into 115, you would perform division. 115 divided by 5 equals 23. Therefore, 5 goes into 115 a total of 23 times.
115 = 5 x 23
115 ÷ 3 = 38 1/3 ≈ 38.33
115 dimes.