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20 10 why is X 1-X2 equal to 2 in the detailed explanation of the 25th problem of mathematics in Huangshi senior high school entrance examination?
The analytical formula of straight line AB is y=x+ 1, and the angle between straight line and X axis is 45. If a right triangle with AB as the hypotenuse is constructed,
If one side is |X 1-X2| and the other side is |Y 1-Y2|, the triangle is an isosceles right triangle.
∴ The right angle side is equal to 2/2 times of the hypotenuse, so |X 1-X2|=2.