the sum of the three angles of triangle os 180° proved that
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Answer:
If ABC is a triangle then <)ABC + <)BCA + <)CAB = 180 degrees.
Proof
Draw a line "a" through points A and B. Draw a line "b" through point C and that "b" line should be parallel to line "a".
Since lines a and b are parallel, <)BAC = <)B'CA and <)ABC = <)BCA'.
It is obvious that <)B'CA + <)ACB + <)BCA' = 180 degrees.
Thus <)ABC + <)BCA + <)CAB = 180 degrees.
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Step-by-step explanation:
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