The basic unit is a metre. This is divided into 10 decimetres, 100 centimetres or 1000 millimetres.
1000 metres = 1 kilometre.
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The formula for the perimeter of an equilateral triangle is P = 3s, where P is the perimeter and s is the length of one side. The formula for the area of an equilateral triangle is A = (s^2 * sqrt(3)) / 4, where A is the area and s is the length of one side.
The sum of all angles in any triangle equals 180 degrees.
If the length of a side is x centimetres, then the volume is x3 or x*x*x cm3
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