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# Radius of a nucleus? watch

1. I thought of using R=(1.2X10^-15)A^1/3 equation but I don't know how to find the area. I know A=pi r^2 but I don't know r.
2. (Original post by Airess3)

I thought of using R=(1.2X10^-15)A^1/3 equation but I don't know how to find the area. I know A=pi r^2 but I don't know r.
Right idea, but A is the Atomic mass number (number of protons + neutrons) in that equation, not the area of a circle. Put in A=197 and you should get the right answer.
Right idea, but A is the Atomic mass number (number of protons + neutrons) in that equation, not the area of a circle. Put in A=197 and you should get the right answer.
Thanks!

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