Question 242224
The circumference (c) of a circle is the distance around the circle. 
The diameter (d) is the distance across the circle and through the center.
Pi = {{{pi}}}, is the ratio between the two.
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The equation is: {{{pi=c/d}}}, but since we are looking for the circumference, we can use the equation this way: {{{c=pi*d}}}
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It's best to use a calculator with these problems.  If your calculator does not have the symbol for Pi, then use its rounded value: 3.14
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{{{c=pi*1.50}}}
{{{c=4.71}}}
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{{{c=pi*1.75}}}
{{{c=5.50}}}
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Done!