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00:00 - 00:59 | green questions is there in the given figure a transversal and cuts to lines l and M if angle 1 is equal to 70 degree and Angle 7 is equal to 80 degree is line alfalah 2002 question is now this is the figure given the measure of angle 1 we are given the measure of angle 77 is equal to 80 degree and Angle 1 is equals to 70 degree now this is these are the two line intersecting at this point so angle 7 angles 5 and vertically opposite angles and we know that vertically opposite angles are equal so we have angle 5 is equal to 17 is equal to 80 degree reason being vertically opposite angles now we have the value of angles 5 also the value of angle 5S 18 degree know if you observe angles 5 and angle 1 this is the transfers of this is the line and according to question which is the transversal |

01:00 - 01:59 | single one angle fibre corresponding angles what we observe that angles 5 is equal to angle 5 years just found out that angle 5 is equal to 80 degree and the question we are given that angle 1 is equal to 70 degree so what do you observe that angle one of the corresponding angles 1 and angles 5 or not equal now we know that if suppose there are two lines so there are two lines and there is a transfer something like this is this is N and this is am and this is as these are the two lines in this is a transversal no is this angle is not equal to angle that means corresponding angles is the corresponding angles formed by the transversal are not equal then we will say that the line l will not be parallel to line and Angle B and angle fibre corresponding angles and they are not equal so we will conclude that therefore line l is not parallel to line |

02:00 - 02:59 | because angle 1 and angles 5 are corresponding angles and they are not equal therefore line l is not parallel to line that's so thank you |

**Adjacent Angles **

**LINEAR PAIR Two adjacents angles are said to form a linear pair of angles if their non-common arms are two opposite rays.**

**VERTICALLY OPPOSITE ANGLES Two angles formed by two intersecting lines having no common arm are called vertically opposite angles.**

**ANGLES AT A POINT Angles formed by a number of rays having a common initial point are called angles at a point.**

**COMPLEMENTARY ANGLES If the sum of the measures of two angles is `90^@` then the angles are called complementary angles and each is called a complement of the other.**

**SUPPLEMENTARY ANGLES Two angles are said to be supplementary angles if the sum of their measures is `180^@` and each of them is called a supplement of the other.**

**Parallel lines**

**Parallel rays**

**Parallel segments**

**Remarks It should be noted that if two lines are not parallel then they intersect. Thus two lines in a plane are either parallel or intersecting.**