ICSE BoardEnglish MediumSTD 7MATHSTriangles3 Marks
Question
Find the unknown angles in the given figure:
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Answer
In the figure, Let each equal angle of an isosceles triangle be $x$, then $x+x=86^{\circ} \Rightarrow 2 x=86^{\circ}$ $ \Rightarrow x=\frac{86^{\circ}}{2}=43^{\circ} $ But $p+x=180^{\circ}$ (Linear pair) $ p+43^{\circ}=180^{\circ} $ $ \Rightarrow \mathrm{p}=180^{\circ}-43^{\circ} $ $ \Rightarrow \mathrm{p}=137^{\circ} $ Hence $p=137^{\circ}$
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