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00:00 - 00:59 | hello friend today 14 age can a triangle have on girls footwear are from by 3 part of right angle one right angle major 90 degree because right angle means 90 degree degree and 1 by 3 part of 90 degree is 1 by 3 so that is 90 degrees 30 degree as we know that sum of angles of 30° 90 + 60 + 30 is equal to 180 degree triangle can have angle |

01:00 - 01:59 | whose measure r13 right angle 1 right angles and |

**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.**