Statement Reason
Points A, B, and C form a triangle.
given
Let DE be a line passing through Band parallel to AC. definition of parallel lines
23 - 25 and 21 - 24
m21 = m 24 and m23 = m 25
m24+ m2 2 + m25 = 180°
m21 +22+ m23 = 180°
angle addition and definition of a straight line
substitution

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