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First we must ignore the fact that nothing can have an area of 20 cm since an area would be measured in SQUARE cm.
There are infinitely many posibilities.
Let one of the sides next to the right angle be of any length x and let the other side next to the right angle be of length 40/x.
Then the area of the triangle will by 0.5*x*40/x = 20 cm2.
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