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The question
Question: find the area of a parallelogram with base 10 and height 6.
The slanted side is 5.
The height goes straight up: it is the shortest way from the top to the bottom.
So the slanted side can't be shorter than the height.
This parallelogram is impossible.
slanted side 5 < height 6 impossible
Answer
slanted side 5 < height 6 impossible