Which is a right angle?, , , , Which is less than 90o ?, obtuse, right, acute, Which is a straight angle (exactly 180o)?, , , , Which are supplementary angles?, , , Which are adjacent angles?, , , Which are complementary angles?, , , , Which are vertical angles?, , , , , Vertical angles ..., are the congruent (the same), add up to 180o, add up to 90o, share a side.

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