Prove the sum of triangle is 180 degres

Asked by  | 18th Sep, 2012, 05:19: AM

Expert Answer:

Start with the following triangle with arbitrary values for the angles:





Since angle a, angle b, and angle c make a straight line,

angle a + angle b + angle c = 180 degrees

Since alternate interior angles are equal, angle a = angle x and angle b = angle y

Therefore, angle x + angle y + angle c = 180 degrees

Answered by  | 18th Sep, 2012, 09:34: AM

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