True, The sum of the three interior angles in any triangle is always 180 degrees., Alternate interior angles are equal when two lines are parallel., The triangle angle sum theorem is valid and true for all types of triangles., To prove that the sum of angles in a triangle is 180°, we can draw a line parallel to one side of the triangle through the opposite vertex., If two angles of a triangle are 45° and 60°, the rule "Sum of angles = 180°" can be used to find the exact measure of the third angle., False, The sum of the interior angles of a triangle changes depending on the size of the triangle., Corresponding angles on a transversal line are always supplementary (add to 180°)., A single triangle can have two different interior angles that both measure 100 degrees., In the text proof, alternate interior angles are used because they always add up to 180 degrees., If a triangle has one right angle (90°), the sum of the remaining two interior angles must be 100 degrees.

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