area=basexheight=18x5=90
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Area = length*perpendicular height
To find the height of a parallelogram, you divide the area by the base length. So in this case, the height of the parallelogram would be 115/12 = 9.58 to the nearest hundredth.
Multiply the length of the base by the vertical height.
The formula for the area of a parallelogram is the same as for a rectangle. base x height Just remember that the height is a line drawn perpendicular to the base, not the other side length.
It depends upon the shape. For example, if it is a parallelogram, then divide the area by the height to get the base.