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Terry Deng · Answer 1 · 2020-05-24T08:32:06+0000

you need to know what type of triangle it is , all your triangles are right angles that means that they are 90° so you just need to subtract the number that its given from 90° ex
the first problem you just have to do this
21° - 90° = 79 °
so x = 79°

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