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Mathematics, 31.10.2020 18:30 britney94
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Points A, B, and C form a triangle. Complete the statements to prove that the sum of the interior angles of ÎABC is 180°.
Statement Reason
Points A, B, and C form a triangle. given
Let be a line passing through B and parallel to . definition of parallel lines
â 3 â
â 5 and â 1 â
â 4
mâ 1 = mâ 4 and mâ 3 = mâ 5
mâ 4 + mâ 2 + mâ 5 = 180° angle addition and definition of a straight line
mâ 1 + mâ 2 + mâ 3 = 180° substitution
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