## anonymous 5 years ago Two vertices of a regular tetrahedron are located at A= (0,0,0) and B= (1, 0, 0) The centroid is at X= (1/2, (√3)/6, (√6)/12). What is the measure of angle AXB, to the nearest degree?

1. anonymous

REPEAT sorry!

2. anonymous

Just kidding, my feed is glitching!

3. anonymous

Find vector AX and vector BX

4. anonymous

Let's call the vectors u and v. To find the angle$udotv=||u||||v||\cos \theta$