The sum of the measurement of all sides of a non-circular closed-figure gives you it's perimeter.
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the sum of all sides are called a perimeter
The sum of all the sides of a given shape is the perimeter of that shape.
The perimeter of a octagon is the sum of all its sides.
Most, but not all, snowflakes are six sided
Square the two sides then add them up and the square root of this sum gives the length of the hypotenuse