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The lengths of the other two legs are both 12.73 units.
Let each leg be x and use Pythagoras:

2x2 = 324 and x = sq rt (324)

x = 12.72792206 or 12.73 units to two decimal places

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Q: A 45- 45- 90 triangle has a hypotenuse of length 18 units What is the length of one of the legs?
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