Let points P1: (1, 0, 2), P2: (2, 1, 3), P3: (1, 5, 4) be given in space.
a) From a rough graph, verify that the points are vertices of a triangle.
b) Find the lengths of the sides of the triangle.
c) Find the angles of the triangle.
d) Find the area of the triangle.
e) Find the length of the altitude on side P1 P2.
f) Find the midpoint of side P1 P2.
g) Find the point where the medians meet.
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