A ruler is an instrument for measurement used for:
Rulers can be used at / in:
In the past, teachers would also use rulers to slap across the knuckles of misbehaving students.
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with a ruler
No
The easy way to find the length of a pencil is to use a ruler to measure it. A "small" ruler might not make it, but a "regular" one foot ruler will do the job nicely.
a piece of paper, and a ruler
A meter stick, a yard stick, a protractor, a compass if you can think of any more please add to this answer