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Triangles — MATHS STD 7 — Question

ICSE BoardEnglish MediumSTD 7MATHSTriangles3 Marks
Question
Find the unknown marked angles in the given figure:
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Answer

In the figure,
$\angle A+\angle B+\angle C=180^{\circ}$.....(Sum of angles of a triangle)
$ \begin{aligned} & \mathrm{k}^{\circ}+\mathrm{k}^{\circ}+\mathrm{k}^{\circ}=180^{\circ} \\ & \Rightarrow 3 \mathrm{k}^{\circ}=180^{\circ} \\ & \Rightarrow \mathrm{k}^{\circ}=\frac{180^{\circ}}{3}=60^{\circ} \end{aligned} $
Hence $\angle \mathrm{A}=\mathrm{k}^{\circ}=60^{\circ}, \angle
\mathrm{B}=\mathrm{k}^{\circ}=60^{\circ}$
and $\angle \mathrm{C}=\mathrm{k}^{\circ}=60^{\circ}$

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