Question 650021



{{{A=r^2*pi}}}

{{{c=2r*pi}}}

if area and circumference are the same non zero number, then

{{{r^2*pi=2r*pi}}}

{{{r^cross(2)*cross(pi)=2cross(r)*cross(pi)}}}

{{{r=2}}}

check:

{{{A=r^2*pi}}}...=>...{{{A=2^2*pi=4pi}}}

{{{c=2r*pi}}}..=>...{{{c=2*2*pi=4pi}}}