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Lines and Triangles — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsLines and Triangles2 Marks
Question
In the figure given below, state which lines are parallel and why?
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Answer

In the given figure, $\angle\text{BAC}=\angle\text{ACD}=110^\circ$ But, these are alternate angles when transversal $AC$ cuts $AB$ and $CD$. Hence, $AB \| CD.$

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