Question 1194245
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Answers: 
Exact circumference = {{{16pi}}} inches
Exact area = {{{64pi}}} square inches


Work Shown for the circumference
d = 16 = diameter
{{{C = pi*d}}}
{{{C = pi*16}}}
{{{C = 16pi}}}


Work Shown for the area
d = 16 = diameter
r = d/2 = 16/2 = 8 = radius
{{{A = pi*r^2}}}
{{{A = pi*8^2}}}
{{{A = pi*64}}}
{{{A = 64pi}}}


Those results are exact in terms of pi.
To get approximate versions of each, replace pi with something like 3.14; use more decimal places of pi to get better accuracy.
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