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On an LED, one leg will be shorter than the other. The shorter leg is the negative polarity.
Anode and cathode. Anode = negative lead, cathode = positive lead.
Break a leg Toi Toi Toi
The answer will depend on the context in which the legs are defined. Since no information on that is provided, it is not possible to give a more helpful answer.
If the side has length x, then x2 + 152 = 252 ie x2 + 225 = 625 or x2 = 400 so that x = +/- 20 Since the negative root makes no sense, x = 20 units.