- #1

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## Homework Statement

## Homework Equations

l = int( sqrt( 1 + (dy/dx)^2) dx) from a to b

## The Attempt at a Solution

So far I'm stuck at the R^2 thing. I know if it was just R it would mean the set of all real numbers, but I'm not sure as to what R^2 means and I don't know how to google that. Normally I would ignore it and just try to do the arc length of the 9x^2 = 4y^2 from 0 to 1 part, but that equation is just two straight opposite sloped lines right? So I know the R^2 has to mean something important, but I can't figure it out.