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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 ABBC and CA that form the triangle ABC are called the sides of the triangle ABC.**

**Angles the three angle `BAC ,ABC and ACB` are called the angles of `Delta ABC.`**

**Elements or parts the three sides AB BC CA and three angles A B C of a Delta ABC are together called the six parts of elements of the `Delta ABC.`**

**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`.**

**Altitudes the perpendiculars drawn from the vertices of a triangle to the opposite side are known as the altitudes of the triangle.**

**Medians the line segments joining the vertices to the mid-points of the opposite side of a triangle are known as its medians.**