Its either a measuring device that usually measures in inches or centimeters.. or it is a person in charge of people or land who "rules" the land
a ruler is used to measure inches or 1 foot
A ruler.
measuring scale, tape, or ruler is used.
Jim used his ruler to measure the length of his finger. Bob is the ruler of the world.
Ruler
One fourth of 1 inch. Look at a ruler and divide a half inch in half-that's a quarter inch.
The answer depends on the graduations marked on the ruler.
A ruler is used to help us measure things.
the ruler was used to measure the length of my book.
Measuring things
A ruler.
nothing