?Which of the following is not true about triangles?
?
A. ?The sum of the interior angles of right triangles is 180?.
B. ?The sum of the interior angles of an obtuse triangle is equal to the sum of the interior angles of any triangle.
C. ?The angle of any triangle is equal to the sum of the other two angles.
D. ?The angle of any triangle is equal to 180? - the sum of the other two angles.
E. ?The equation that can be used to find a missing angle in a triangle, if the other two angles are given, is: A + (B + C) = 180?, where A is the missing angle, and B and C are given angles of the triangle.
Answer: C
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