You can measure it with a ruler.
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For a parallelogram, take the base times the height. For a trapezoid, take the smaller base and times it by the height.
base x 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.
Area = length*perpendicular height
To find the area of a parallelogram you have to multiply the base by the height. Therefore A=17∙13. Find the product of 17 and 13 which is 221. A=221. Therefore the area of the parallelogram is 221u(for units)2.