Question 118659
If the diameter of a circle is {{{d =1.3*10^-12m}}} meters, 

then radius {{{r}}}?

{{{r = d/2}}}

{{{r = 1.3*10^-12m /2}}}

{{{r = (1.3/2)(10^-12)m }}}


{{{r = 0.65(10^-12)m }}}