3 Select the correct answer from each drop-down menu,
С
Points A B and Cform a triangle. Complete the statements to prove that the sum of the interior angles of AABC is 180°
Statement
Reason
Points A, B, and 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°
m2 1 + m2 2 + m 23 = 180°
angle addition and definition of a straight line
substitution
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