Question

sum of the angle of triangle 180 ​

Answer 1

Answer:

Make a line just up of triangle and all angle is alternate

Answer 2

Step-by-step explanation:

Proof that the sum of the angles in a triangle is 180 degrees

Theorem

If ABC is a triangle then <)ABC + <)BCA + <)CAB = 180 degrees.

Proof

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.

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