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points a, b, and cform a triangle. complete the statements to prove that the sum of the interior angles of aabc is 180°.
given
statement
reason
points a, b, and form a triangle.
let de be a line passing through band parallel to ac. definition of parallel lines
23 25 and 21 224
m_1 = m 24 and mz3 = m25
m24+ m2 + m 25 = 180°
angle addition and definition of a straight line
m 1 + m2 + m 23 = 180°
substitution
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