Many people think there is only one “right” way to teach geometry. For two millennia, the “right” way was Euclid’s way, and it is still good in many respects. Was this the new “right” way, or was the “right” way something else again, perhaps transformation groups?

Many people think there is only one “right” way to teach geometry. For two millennia, the “right” way was Euclid’s way, and it is still good in many respects. Was this the new “right” way, or was the “right” way something else again, perhaps transformation groups?