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
The answer depends on the graduations marked on the ruler.
One fourth of 1 inch. Look at a ruler and divide a half inch in half-that's a quarter inch.
A ruler is used to help us measure things.
the ruler was used to measure the length of my book.
Measuring things
They used a ruler.
nothing