Mathematics, 06.09.2019 04:20 smolemily

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of abc is 180°.
statement
reason
points a, b, and c form a triangle.
given
let de be a line passing through b and parallel to ac. definition of parallel lines
23 25 and 21 - 24
mz1 =m24 and m23 = m 25
m24+ m2 + m25 = 180°
m21+ m2 + m23 = 180°
angle addition and definition of a straight line
substitution

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Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior an...