Acute angles (less than 90°). Right angle (exactly 90°), marked with a square. Obtuse angles (greater than 90° and less than 180°). Using the combination of different types of angles ...
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HowStuffWorks on MSNWhat Are Supplementary Angles?Two acute angles can combine to form a right angle (complementary), while two obtuse angles will create a third angle larger than 180 degrees (nonsupplementary). What Is the Difference Between an ...
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