Question

Prove that sum of the three angles of a triangle is two right angles or 180°
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Answer 1

Answer:

Let △ABC be a triangle.

Let BC be extended to a point D.

From External Angle of Triangle equals Sum of other Internal Angles:

∠ACD=∠ABC+∠BAC

Bby by Euclid's Second Common Notion:

∠ACB+∠ACD=∠ABC+∠BAC+∠ACB

But from Two Angles on Straight Line make Two Right Angles, ∠ACB+∠ACD equals two right angles.

So by Euclid's First Common

Explanation:

hope this helps you

Answer 2

Explanation:

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in this figure ,Well this question is little confusing after"two right angles or 180 degree ."