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**Introduction**

**The size of a line segment is its length.**

**Units of measurement of length.**

**Closed curve a curve having the same beginning and ending point is called a closed curve.**

**Simple curve a curve is a simple curve if it does not cross itself.**

**Simple closed curve a curve having the same beginning and ending point and which does not cross itself is called a simple closed curve.**

**Interior region the portion of the plane inside the curve or bounded by the curve is called the interior region.**

**Exterior region the portion of the plane outside the curve is called the exterior region.**

**Regions**

**Perimeter the length of the boundary of a closed figure is known as its perimeter.**