Linear Pair - If the sum of two angles is 180 degrees they are a linear pair , right angle - 90 degrees , acute angle - less than 90 degrees , obtuse angle - greater than 90 degrees , complementary pair  - when the sum of two angles is 90 degrees , acute triangle - the interior angles are less than 90 degrees , right triangle - when one of the interior angles is 90 degrees , obtuse triangle - when one of the angles is greater than 90 degrees ,

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