Using trig to solve for the missing angle

Step-by-step explanation:

Since there is a 45 and 90 degree angle, this is a 45-45-90 triangle. The legs are equal in a 45-45-90 ttiangle. The hypotenuse sqr root of 2 times more than the legs. So this means the hypotenuse measure is

So we can set up a equation.

So the missing side is 18

4th option is correct xy=-10

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