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trliner/circumference_in_feet_for_number_of_acres.rb

Last active December 17, 2015 03:38
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Calculate the circumference of a certain number of acres.
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circumference_in_feet_for_number_of_acres.rb
SQUARE_FEET_PER_ACRE = 43560
def circumference_in_feet_for_number_of_acres(number_of_acres)
area = number_of_acres * SQUARE_FEET_PER_ACRE
radius = radius_of_area(area)
circumference_of_radius(radius)
end
# Math::PI * (r ** 2) == area
# r ** 2 == area / Math::PI
# r == Math.sqrt(area / Math::PI)
def radius_of_area(area)
Math.sqrt(area / Math::PI)
end
def circumference_of_radius(r)
2 * Math::PI * r
end
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