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## Homework Statement

1. please help me find the distance from the point (0, 0 ,0) to the line

[tex]x=4-t, y=3+2t, z=-5+3t (-\nfty<t<\infty)[/tex]

2. find the distance between the point (3, 1, -2) and the plane [tex]x+2y-2z=4[/tex]

3 find the principle unit notmal N, the curvature , and the radius of curvature for the plane curve [tex]r(t)=ti+(sint)j[/tex]