First slide
Introduction to 3-D Geometry
Question

If the coordinates of the vertices of a ABC are A(- 1, 3, 2), B(2, 3, 5) and C(9, b, - 2), then  A is
equal to

Easy
Solution

Vertices of ABC are A(-1 ,3,2), B(2, 3, 5) and c(3, 5, -2). 

AB=9+0+9=18

CA=16+4+16=6and  BC=1+4+49=54

 AB2+CA2=BC2

ABC is right angled triangle at A. 

A=90o

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