First slide
Introduction to 3-D Geometry
Question

The ortho centre of triangle formed by the points (2,1,5),(3,2,3), (4,0,4) is

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Solution

The points A(2,1,5), B(3,2,3),  and C(4,0,4) for an equilateral triangle. orthocenter=centroid=2+3+43,1+2+03,5+3+43=3,1,4

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