Question

How to proof that sum of all angle is = 180

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Answer 1

Answer:

Proof of the Angle Sum Property

Step 1: Draw a line PQ that passes through the vertex A and is parallel to side BC of the triangle ABC.

Step 2: We know that the sum of the angles on a straight line is equal to 180°. In other words, ∠PAB + ∠BAC + ∠QAC = 180°, which gives, Equation 1: ∠PAB + ∠BAC + ∠QAC = 180°

Explanation:

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Answer 2

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