geometry
Given that r1=6i8j+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

If r1r2 means r1•r2, then that's just 2
If you mean r1×r2, that would be 66i34j+32k
Again, the alleged choices don't mean much to me.posted by Steve

Given that;r1=6i8j=2k, r2=4i=5j=7k, r3=2i=j=6k. Find r1,r2.
posted by isaac

2
posted by isaac
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