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The symbol for feet is one apostrophe, as in 15 feet = 15' The symbol for inches is two apostrophes, as in 15 inches = 15"
A square route of x is a path around the sides of a square such that the total length of the path is x.
the object's displacement.
A perimeter is a path that surrounds an area. The word comes from the Greek peri (around) and meter(measure). The term may be used either for the path or its length - it can be thought of as the length of the outline of a shape. The perimeter of a circular area is called circumference.
A straight line of infinite length!