I have a hard time of remembering a way to figure the degree measures of angles. I know that a complementary is the sum to equal 90 degrees and the supplementary is 180 degrees. What confuses me is when given two degrees of and angle and one is on the outside of the angle, how do I remember to get the degree of the missing inside angle. Is there an easy way to remember how to figure these without having to go back to the book? I always get twisted up with these for whatever reason.

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If you are trying to calculate an angle x, given another angle y and the fact the two angles are complementary, then

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