Question 146372
If the diameter of a circle 1.3 X 10^-12 meters, then what is its radius?
-------------------
radius = (1.3 X 10^-12 1.3 X 10^-12)/2 
= 0.65x10^-12 
Now multiply the 0.65 by 10 and divide the 10^-12 by 10 to get
= 6.5x10^-13
----------------
Cheers,
Stan H.