source : yahoo.com

## In ABC, C is a right angle,what is the measure of x?

If you can use a calculator, you can use any inverse trig function to get the exact answer and match it to the choices.

But this is just a multiple choice question.

Just look at the picture!

It’s obviously more than 45 degrees. That’s clear from the way the triangle is drawn, and confirmed since the opposite side is more than the adjacent side. Only one of the answers is > 45, so it must be 64.8.

No need to even calculate the exact value if this is just a multiple choice test. Just eliminate the impossible answers–that’s the quickest way.

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