Question
Construct line segments whose lengths are: $12\ cm \ 5\ mm$
✓
Answer
Draw a line L on the paper and mark a point A on it. Take a compass and place its metal point at zero mark of the ruler. Adjust the compass such that the pencil point gets placed at the point which is $5$ small points from the mark of $12\ cm$ to $13\ cm$ of the ruler. Now, take the compass to $L$ such that its metal point is on A. Mark a small mark at $B$ on $L$ corresponding to the pencil point of the compass. $AB$ is the required line segment of $12\ cm \ 5mm.$
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