28.7 Perpendicularity in Space: Tests and Properties
Point 6 of 6
28.7.6 Toward the Vector Method
Core idea
Proving perpendicularity by pure geometry often means hunting for auxiliary lines; next we'll set up coordinates in space and let vectors settle it with a calculation.
Module goal. Master the tests and properties of perpendicularity for line-to-line, line-and-plane, and plane-and-plane along with the key angles, completing the pure-geometry approach and connecting to the vector method ahead.
eastmath.com · 28.7 Perpendicularity in Space: Tests and Properties · 28.7.6 Toward the Vector Method