First slide
Introduction to 3-D Geometry
Question

If A2,3,1B5,6,3C2,3,1 are the vertices of triangle ABC, the length of the median AD is

Moderate
Solution

The midpoint of the side  BC is D=72,32,2

The length of the median  ADis

 AD=7222+3232+122     =94+94+9      =332

Therefore, the length of the median AD is  332

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