Question 1053309
Find the relationship between area and circumference for a circle.
{{{C=2pi*R}}}
{{{A=pi*R^2}}}
So then,
{{{R=C/(2pi)}}}
{{{R^2=C^2/(4pi^2)}}}
Substituting into the area equation,
{{{A=pi*(C^2/(4pi^2))}}}
{{{A=C^2/(4pi)}}}
So now,
{{{25pi=C^2/(4pi)}}}
{{{C^2=100pi^2}}}
{{{C=10pi}}}