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--- lecture_21_slides [2016/04/14 11:29] – rupert
+++ lecture_21_slides [2017/04/18 09:18] (current) – rupert
@@ Line 37: / Line 37: @@
 ==== Orthogonal planes ====
-Let~$\Pi_1$ be a plane with normal vector $\nn_1$ and let $\Pi_2$ be a plane with normal vector $\nn_2$.
+Let $\Pi_1$ be a plane with normal vector $\nn_1$ and let $\Pi_2$ be a plane with normal vector $\nn_2$.
 $\Pi_1$ and $\Pi_2$ are //orthogonal// or //perpendicular// planes if they meet at right angles. The following conditions are equivalent:
@@ Line 75: / Line 75: @@
   * Sub in: $d=0-13(3)+17(2)=-39+34=-5$
   * Answer: $-2x-13y+17z=-5$, or $2x+13y-17z=5$.