- #1
jaejoon89
- 195
- 0
Given vertices of regular tetrahedron OABC, prove that vector OA + OB + OC is perpendicular to plane ABC...
I've been racking my brain on this one, can't figure it out... would appreciate some help
I thought I'd center it on the origin:
(0, 0, 0)
(1, 0, 0)
(0, 1, 0)
(0, 0, 1)
A + B + C = (1, 0, 0) + (0, 1, 0) +(0, 0, 1) = (1, 1, 1)
(not sure if that's right - seems like it would be outside the tetrahedron)
No idea where to go from there.
I've been racking my brain on this one, can't figure it out... would appreciate some help
I thought I'd center it on the origin:
(0, 0, 0)
(1, 0, 0)
(0, 1, 0)
(0, 0, 1)
A + B + C = (1, 0, 0) + (0, 1, 0) +(0, 0, 1) = (1, 1, 1)
(not sure if that's right - seems like it would be outside the tetrahedron)
No idea where to go from there.