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I'm having big problems rearranging the following equation which calculates the pressure at the centre of Earth, to find R:

P = 2(pi*G/3)*ρ2 R2

Logically to me it would be:

R = 2(pi*G/3P)*ρ2 square rooted (but i'm pretty certain this isn't right!)

I've spent ages trying to sort it out and have resorted to randomly placing the figures in an attempt to find R (radius of the earth which is known already)!!

If anyone could help me sort it out in my head so that I can then rearrange the equation it would be much appreciated!!

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# Homework Help: Rearranging an equation for pressure

**Physics Forums | Science Articles, Homework Help, Discussion**