Our third excursion in the “Video Safari of Euclid’s Elements”!

We have two straight lines, one bigger than the other. How do we cut a piece out of the longer one equal to the length of the shorter one? (Or as *Euclid’s Elements: All Thirteen Books Complete in One Volume* puts it: “Given two unequal straight lines, to cut off from the greater a straight line equal to the less.”

Ready to drive into the mathematical wild?

Hop on the Land Cruiser!

The GeoGerbra link is available here.

This is a relatively short proof. It needs more cowbell.

Thanks for watching!

P.S. The YouTube “Video Safari of Euclid’s Elements” is here, and Math.Promo’s page for it is here.