Jawabanmu

2014-04-25T13:17:06+07:00
Rp = p - r
(6-5, 3 - 6, 3 - 6)
= (1, -3, -3)

rq = q - r
(4 - 5, 5 - 6, 4 - 6)
= (-1, -1, -2)

panjang proyeksi 
=(rp) (rq)
    IrqI
= (1 x -1) + (-3 x -1) + (-3 x -2)
       √(-1)² + (-1)² + (-2)²
= -1 + 3 + 6
   √6
=   8
   √6
irasionalkan
4√6
    3
1 3 1