Dear all,

I want my students to solve an equation like \(V=\pi (r_2^2-r_1^2)h\) for \(r_1\) using the Equivalence reasoning answer typ with the option assume_pos.

I have set the option "assume_pos" both in the input type options and the question options. But my question does still not condone rooting both sides of the equation:

Any idea, what I did wrong?

Thanks, Stephan.