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Triangles — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsTriangles1 Mark
Question
An exterior angle of a triangle is greater than the opposite interior angles.
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Answer

According to exterior angle theorem,
$\text{ext.x}=\angle\text{CAB}+\angle\text{CBA}$
Since, the exterior angle is the sum of its interior angels.
Thus,
$\text{ext.x}>\angle\text{CAB}$
$\text{ext.x}>\angle\text{CBA}$

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