Four.
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Yes any polygon that has 4 sides is a quadrilateral.
Add the lengths of any two adjacent sides, and double the sum.
In order to find the area of parallelogram is found by knowing the area formula. The formula is A=b(base) multiplied by H(height).
10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.