Question

why the measure of triangle is 180 degree only??​

Answer 1

Answer:

hello mate

In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the angle in the bottom right corner to make a 1800 angle. The inevitable conclusion of this game is that the interior angles of a triangle must always add up to 1800

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Answer 2

Step-by-step explanation:

there is a proof for it.

Draw line a through points A and B. Draw line b through point C and 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.