Area = vertical height x base
Be certain it's the vertical height and not the length of one of the edges you're using.
If you have the lengths of 2 sides and the angle between them, you can use this formula:
Area = xy * sin A
Just multiply the two lengths together and multiply that by the sine of the angle between them.
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The formula for area of a parallelogram is bh. Base times height.
A formula is needed to find the area of a parallelogram. It is a very simple formula which notates Area = base x height.
rectangle
Hopefully you've been given the parallelogram's area. If so you can use the following formula: Area of parallelogram = base length x altitude therefore altitude = area of parallelogram (divided by) base length
Assuming that you are asking about the formula for the AREA of a parallelogram (there is no formula for a parallelogram), A = bh where A is the "area", b is the length of any side (called a "base"), and h is the "height" measured perpendicular from that base to the opposite side.