Question
In the figure, l || m. If $\text{AB}\perp\text{l}$ and AB = 2.3cm, find CD.

Answer

At point A, AB is the perpendicular distance between l and m.
At point C, CD is the perpendicular distance between l and m.
The perpendicular distance between two parallel lines is same at all points.
Therefore, CD = AB = 2.3cm

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