<p>justbreathe: Thank you for answering my question (whether that was actually your intent or not).</p>
<p>When I learned high school geometry and trig (I was in high school from 1999-2003), it was largely through proofs and derivations, except for maybe the analytic geometry units. Very useful stuff, I thought. I don’t know how standard that is, either in the “traditional” approach or the ones we’re talking about in this thread.</p>