Did you know that according to MathWorld you can square the circle using the compass and straight-edge in the hyperbolic plane? How long have you known this? Why have you been keeping it from me?

Did you know that according to MathWorld you can square the circle using the compass and straight-edge in the hyperbolic plane? How long have you known this? Why have you been keeping it from me?

What does that even mean? Is the straight-edge euclidian-straight or hyperbolic-staight?

Hyperbolic-straight, I presume. Otherwise it seems contentless.