# geometry

Given that r1=6i-8j+2k,r2=4i+5j+7k,r3=-2i+j+6k is a vector. Find r1r2,r2r3,r3r1(a)30,21,-8(b)26,23,8(c)24,19,-7(d)19,27,7

asked by grace
1. If r1r2 means r1•r2, then that's just -2
If you mean r1×r2, that would be -66i-34j+32k

Again, the alleged choices don't mean much to me.

posted by Steve
2. Given that;r-1=6i-8j=2k, r2=4i=5j=7k, r3=2i=j=6k. Find r1,r2.

posted by isaac
3. -2

posted by isaac

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