Its side!
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The length of the third side is 20 cm
Place the ruler side by side with the object. One of the edges of the object should be in the "0" value of the ruler. Then just see where the other edge is and there you have it.
no. height is the length from the top of the object to the bottem. while width is the left side of the object all the way to the right side of that certain object.
Parallelogram
on the left hand side