Hello,
There is no such thing as an irregular rectangle. This being said, I believe that the area of a parallelogram is still equal to the product of the base by the height.
Draw your parallelogram with one side horizontal. From the next corner, draw a line perpendicular to the base. The length of the segment you just drew is h. If b is the length of the base the area is b*h.
Hope it helps.
, the area of a triangle must be one-half the area of a parallelogram. Thus, the formula for the area of a triangle is:
or
where 
is the base, 
is the height and · means multiply.
The base and height of a triangle must be perpendicular to each other. In each of the examples below, the base is a side of the triangle. However, depending on the triangle, the height may or may not be a side of the triangle. For example, in the right triangle in Example 2, the height is a side of the triangle since it is perpendicular to the base. In the triangles in Examples 1 and 3, the lateral sides are not perpendicular to the base, so a dotted line is drawn to represent the height.
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For a parallelogram area equals the base times the height becase both sides ar parallel and have have the same angles. A= B*H For the irregular rectangle, it depends on how much information is given. Normally you can break the figure into rectangles and triangles and them add the areas together.
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