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**Introduction**

**TRIANGLE A plane figure formed by three non-parallel line segments is called a triangle.**

**SIDES The three line segments `AB BC and CA` that form the triangle `ABC` are called the sides of the triangles `ABC.`**

**ANGLES The three angles `\_ BAC \_ ABC and \_ACB` are called the angles of `DeltaABC`.**

**ELEMENTS OR PARTS The three sides `AB BC CA` and three angles `\_A \_B \_C` of a `DeltaABC` are together called the six parts or elements of the `DeltaABC.`**

**INTERIOR The part made up by all such points P which are enclosed by `DeltaABC` is called the interior of `DeltaABC.`**

**EXTERIOR The part made up by all such points Q which are not enclosed by `DeltaABC` is called the exterior of `DeltaABC`.**

**TRIANGULAR REGION The interior of `DeltaABC` together with the `DeltaABC` itself is called the triangular region `ABC`.**

**Naming of triangles by considering the lengths of their sides scalene triangle A triangle whole no two sides are equal is called a scalene triangle.**

**ISOSCELES TRIANGLE A triangle whose two sides are equal is called an isosceles triangle.**