PART - 1 CH : 5 Parallel and Intersecting Lines — MATHS STD 7 — Question
Gujarat BoardEnglish MediumSTD 7MATHSPART - 1 CH : 5 Parallel and Intersecting Lines3 Marks
Question
Find whether the lines AB and CD are parallel or not.
✓
Answer
$\angle C I F+\angle F I J=180^{\circ} "[$ Linear pair $]$ $\angle C I F=180^{\circ}-\angle F I J$ $=180^{\circ}-50^{\circ}=130^{\circ}$ So, $\angle ALI =\angle CIF =130^{\circ}$. If two parallel lines are intersected by a transversal, then each pair of corresponding angles are equal. Here, $\angle ALI =\angle CIF =130^{\circ}$ are two corresponding angles. Hence, $A B \| C D$.
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