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Question: i need help with 2...

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2. Point A(4,2,5) and two vectors Ra (20,18,-10) and RaN (-10,8,15) define a triangle. Find a) if any corner is a right angle. b) the vector projection of RMav on Ru c) the area of the triangle d) a unit vector perpendicular to the plane in which the triangle is located e) a unit vector in the plane of the triangle and perpendicular to RAv f) the perpendicular distance from point A on Rv

I need help with 2.

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