The 15 cm side is equivalent to the y centimeter side.
A parallelogram is a special type of quadrilateral that has both pairs of opposite sides parallel and equal.
So from the given question the given figure can be inferred which is attached below
The "y" side of the parallelogram corresponds to the bigger side of the parallelogram, as seen in the figure, and the "x" side corresponds to the shorter side.
Since "y" relates to the longer side and the longer side is 15 cm, the 15 cm side is equivalent to the y centimeter side.
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