The measurement used depends an the distance.
A table top may be measures in feet and inches, or cm and mm. A journey from coast to coast across the UK, would be in miles and yards (or miles and feet), or kilometres and metres.
The bore of a copper pipe may be in 1/8th or 1/16th, or mm. So one measurement unit doesn't cover all possibilities.
Centimetres are units used for the measurement of lengths (or distances).
The lengths of its sides
The lengths of its sides and the angles. The lengths of diagonals may be substituted for the lengths of appropriate sides.
Linear
A polygon has lengths, angles, a perimeter and area.
The answer depends on what characteristic you wish to measure: the lengths of the sides, the angles, the lengths of the diagonals, perimeter, area, temperature, colour, and so on.
nope dumb qestion
There is no general formula. You could use basic trigonometry.
Solar and Lunar cycles. Some cultures used one or the other for the basis of their yearly calendars.
Millimetres is the most appropriate measuring system.
The measurement scale in meters is a unit of length in the metric system. It is used to measure distances, lengths, and heights. It is represented by the symbol "m".
Anyone who has mastered the measurement of lengths and simple addition can find the perimeter of a plane shape.