What is the constant in the mathematical expression?
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The formula for this is 
. If the diameter is 8 the radius is 4, so filling in accordingly we have 
and 
which is 
and when you multiply in 3.14 you get that A = 401.92 or B above.
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Let A = area
Let w = width
Let (w + 5) = length
A = (w + 5)w
Let A = area
Let w = width
Let (w + 5) = length
A = (w + 5)w