SOLUTION
The formula for area of Parallelogram is given as:
A= Base x Height
The formula for area of a trapezoid is given as:
[tex]A=\frac{1}{2}(a+b)h[/tex]Notice that the area of of the trapezoid can be defined as
A=Average of Base x height.
This implies that the both figures have the formula as a product of base and height.
