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`22^(@)`Transcript

Time | Transcript |
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00:00 - 00:59 | the question is calculate the value of x in the following figure this angle is the exterior angle of triangle pqr show exterior angle property says that exterior angle of triangle exterior angle of a triangle over a triangle is equal to is equal to the sum of sum of two opposite opposite interior angle interior angle so in this triangle these two angles are opposite interior angle so X + 28 is equal to 50 degree by solving these we get x is equal to 50 - 28 so |

01:00 - 01:59 | we can say that x is equal to 22 which is our answer |

**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.**