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What is an exchange from one unit measure to another?
That means that if you have a measurement in one unit, you convert it to another unit. For example, if a measurement is given in millimeters, you may need to convert it to meters.
Which unit of measurement is the most appropriate to measure the circumference of tree trunks?
centimeters
How many meters in 30 diameters?
There is no such unit of measurement as a diameter, a diameter is the length across something. Perhaps you are thinking of a decimetre.
Why do you square the radius when finding the area of a circle?
Whether you are finding the area of a circle or the area of a square or any other geometrical shape, it is always the case that to go from a linear measurement (a radius, a side, or whatever) to a surface area requires you to use a square of the linear measurement; you are increasing size in two dimensions, length and width, and therefore the effect is the increase the area exponentially, not linearly.
What represents the smallest unit of measurement nm mm cm m?
nm. A nanometer represents 10 ^ -9 or one billionth of a meter.
