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Well, we said A and B were complimentary angles and if we notice, they sum to 90
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degrees or a right angle. You usually draw a box in the corner to indicate a
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right angle. If I want to find angle D, I know C and D have to add up to 90
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degrees. I know C is 55 degrees. So, if I just subtract 55 from both sides,
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angle D is 35 degrees. We can use the exact same process for angle E and angle
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F. If I subtract 12 degrees from 90, I get 78 degrees. If you figured out what
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complementary meant, nice work. If not, that's okay. Hopefully, you'll learn
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along the way.