1/2 times height times (base1+base2)
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Area = 1/2*(sum of the two bases)*height
A=m*h m=(a+b)/2
Area measured in square units = 1/2*(sum of the parallel sides)*height
The rule for finding the area of a parallelogram is a simple equation of A=bh. For this equation, the A is area, b is base, and h is height. The area of a parallelogram is equal to the shape's base multiplied by the shape's height.
The trapezoid is a plane figure which has surface Area, but no volume but if there was a 3d figure your equation would be. The Surface Area of a trapezoid = ½(b1+b2) x h X Height of figure.