What kind of Geometry and Measurements are they talking about?

Geometry: Euclid's Elements in Ancient Hebrew read off a Dead Sea Scroll?

Measurement: Proving Taylor's Error Theorem?

Or is it, "What is a triangle?" and "using a ruler measure a line?"

That might take an hour to teach your DS. And I am sure your DS will do one of the former before he is 18.

<sigh?