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How to prove that three points are on a straight line in mathematical geometry? (be specific)
The answer depends on your chart, but the basic method is as follows.

1. Using the concept of right angle, it is proved that two adjacent angles are complementary;

2. Make a straight line through two of the three points, and prove that the third point is on this straight line;

3. (Make the straight line MN and AC intersect at b) If the angle ABM= the angle CBN (or the angle ABN= the angle CBM), then the three points A, B and C are * * * lines;

4. Apply the inverse theorem of Menelaus theorem.