1) The three vertices of a triangle located at A(6,-1,2), B( 2,3,-4) and C(-3,1,5). Find the Interior angle of B.

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Chapter7: Triangles
Section7.5: Vectors: An Algebraic Approach Learning
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1) The three vertices of a triangle located at A(6,-1,2), B( 2,3,-4) and C(-3,1,5). Find the Interior angle of B.

2) Given the vectors: B (2, 5, 1) and C (1, 1, 3). Find the unit vector perpendicular C and A.

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