Angles - Typepad

Angle Measure Subsets Exercise: Yes the subsets are disjoint. Triangles and Angle Measure Theorem Exercise: Suppose we have a triangle that has one angle of 90°. Then, since the sum of the angles of a triangle is 180°. The other two angles are acute and complementary. This argues that a triangle may have at least one angle that measures 90°. ................
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