Mathematics, 17.09.2021 22:10, yurlgurllmay

Points A, B, and form a triangle. Complete the statements to prove that the sum of the Interior angles of ABC nec in
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
m21 = m 24 and 23 = m25
m24+ m2 2 + m 25 = 180°
angle addition and definition of a straight line
m21 + m2 2 + m23 = 180°
substitution
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Points A, B, and form a triangle. Complete the statements to prove that the sum of the Interior angl...