On Fri, 30 Aug 2013 16:30:23 -0700 (PDT), email@example.com wrote:
> I remember in grade school (grade 8 or 9ish) we did geometry with vectors as a tool but without any coordinate system. > > We often picked a random point and called it O, then proved things like if M was midpoint between two points A, B, then: > > OM = 1/2 * (OA + OB) > > A lot of stuff was proven with just points and vectors from points to other points (with the fact OX = -XO used heavily). > > What's the name of this geometry? I'm thinking of looking this stuff up again.