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Answers at the beginning of basic mathematics training
Question 3: The line segment connecting the midpoints of the two waists of the trapezoid is called the midline of the trapezoid. The center line of the natural trapezoid is parallel to the two bottom sides and is equal to half of the sum of the two bottom sides.

If a group of equidistant parallel lines have equal segments on a straight line, then the segments on other straight lines are also equal.