Please write the derivation process of trapezoidal area formula

Please write the derivation process of trapezoidal area formula

(upper bottom + lower bottom) × height △ 2
Two identical trapezoids can form a parallelogram. The height of parallelogram is the height of trapezoid, and the bottom of parallelogram is the top and bottom of trapezoid. The area of parallelogram is twice that of trapezoid, so divide by 2