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A math problem: nail a triangular wooden frame, one side is 40cm long, the other side is 50cm long and the other side is how long.
You should choose D.

Because there are many possibilities.

If 50 cm is the hypotenuse.

The third side is 30cm.

If the third side is a hypotenuse

The third side is 10 root number 4 1.

So there should be two answers, so choose D.