Question
In Figure, state which lines are parallel and why?
✓
Answer
Let, $F$ be the point of intersection of the line $CD$ and the line passing through point $E$.
Here, $\angle \text{ACD}$ and $\angle \text{CDE}$ are alternate and equal angles.
So, $\angle \text{ACD}=\angle \text{CDE}=100^\circ$
Therefore, $\text{AC}||\text{EF}$
Here, $\angle \text{ACD}$ and $\angle \text{CDE}$ are alternate and equal angles.
So, $\angle \text{ACD}=\angle \text{CDE}=100^\circ$
Therefore, $\text{AC}||\text{EF}$
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