It is the same as the area of a rectangle, you simply x length by width. This is because the slanted edges kind of cancel each other out.
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The area formula for the parallelogram is related to the area formula for a rectangle because you can make the parallelogram into a rectangle to find the area.
Area of a parallelogram in square units = base*height
If the heights and bases are the same, then the triangle is half the area of the parallelogram.
height x base length. The area of a parallelogram is equal to the length of the base times the shortest distance to the opposite side.
The area of the parallelogram is quadrupled.