Is this the simplest way to visually prove the "scalene trapezoid area formula" Please refer to image. Is there a simpler way to visually prove the scalene trapezoid area formula? ![Scalene trapezoid area proof](

Add a rotated copy of your trapezoid to form a parallelogram of twice the area.

![enter image description here](

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In case you forgot that this parallelogram has area $(a+b)h$, note that the triangles in the following image are congruent, hence the area of the parallelogram equals that of the rectangle.

![enter image description here](