Basic units are:
Length meter m
mass (weight) kilogram kg
time second s
electric current amp aTemperature Celsius C or Kelvin K
Amount of substance mole mol
Luminous intensity candela CD
there are many other derived units.
seehttp://lamar.colostate.edu/~hillger/basic.htm
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First, you need one or more measures of height.Add all these measures together.Next you count how many measures you have.Divide the sum of all the heights by the number of measures.The answer is the mean height.
With trigonometry by using the cosine rule
360 degrees
A regular polygon
All the sides are different measures.