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Midpoint-a mathematical term
In solving problems, we often encounter "midpoint", so how do we use the particularity of midpoint position to solve problems? First of all, let's understand several theorems related to the midpoint:

① The midline, height and bisector of the top angle on the bottom of the isosceles triangle coincide;

② The median line on the hypotenuse of the right triangle is equal to half of the hypotenuse;

③ The midline of the triangle is parallel to the third side, which is equal to half of the third side; The midline of the trapezoid is parallel to the two bottom sides and equal to half of the sum of the two bottom sides;

④ A straight line passing through the midpoint of one side of a triangle and parallel to the other side will bisect the third side; A straight line passing through the midpoint of one waist of the trapezoid and parallel to the bottom will bisect the other waist.