Question
Find the distance between the parallel lines $l$ and $m$, using a set square.
✓
Answer
Distance between $l$ and $m$ is $1\ cm.$ Place the ruler so that one of its measuring edges lies along the line $l$. Hold it with one hand. Now place a set square with one arm of the right angle coinciding with the edge of the ruler. Draw the line segment $PM$ along the edge of the set square, as shown in figure. Then, measure the distance $(PQ)$ between $l$ and $m$ as $1\ cm$.
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