How to deduce trapezoidal area formula

If the same trapezoid is placed upside down next to the original trapezoid, a parallelogram can be obtained, and it can be seen that the trapezoid area is half of the parallelogram, the bottom of the parallelogram is equal to the top and bottom of the trapezoid, the height is equal to the height of the trapezoid, the area of the parallelogram is equal to the bottom multiplied by the height, that is, the sum of the top and bottom of the trapezoid multiplied by the height, and the trapezoid area is half of the parallelogram, So the trapezoid area is equal to (bottom and top) times the height divided by 200

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