Try solving this question.

**How do you prove that the angles of a triangle adds up to**

**180**?^{o}^{}There's a few way in which this problem can be solved.

1) By using a protractor and measuring all the angles and adding up the angles to prove that the angles of a triangle adds up to 180

^{o}^{ }

2) As 180

^{o}forms a straight line, another way to prove it is to tear out the angles of a triangle and put them together. If they are able to form a straight line, it will prove that the angles of a triangle adds up to 180

^{o}.

3) According to angles of properties, angle XBC= angle BAC (alternate angles). angle YBC= angle BCA (alternate angles). Therefore, angle XBA + angles ABC + angle YBC= 180

^{o}, which also means that angle ABC + angle BAC + angle ACB= 180^{o}.
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