A standard ruler is 12 inches or 1 foot
The average length of a ruler is 12 inches.
the ruler was used to measure the length of my book.
the tool of length is a RULER!
Yes, the ruler does need to be straight when finding or measuring the length of a country on a map. If the distance curved, you can use a string and the ruler to measure the length.
a ruler is something that measures the length of an object
Ruler
A metric ruler is 30 cm in length. This type of ruler is commonly called a metric foot ruler because it is similar in length to a one foot ruler.
30cms normally, depends on the length of the ruler
Ruler/Walking ruler thingy
about the length of a ruler
Beam
A ruler!