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00:00 - 00:59 | hi students are question as in figure 76 ab is parallel to CD find the values of X Y and Z Super in the question we can say one 25° + x is equal to 180 degrees reason they are on the same straight line and sum of all angles on a straight line is equal to 180 degrees so also we can say that for me linear pair write the following linear pair are as they are on the same straight line so we can say X will be equal to 180 degrees -1 25 degrees so 180 - 125 degree is equal to 10 - 57 - 25 so it will be equal to 55 degrees so x is equal to 55 degrees what we have to do we have to give given that AB AB is parallel to CD if ab is parallel to CD right and ac is a transversal easy |

01:00 - 01:59 | trans was so we can say that two angles on the same on the same side of transferred they are co interior angles so and summer co interior angles is equal to 180 degrees X + that will be equal to 180 degrees reason there co-interior there co interior angles single-axis 55° 55° + angle said will be equal to 180 degrees angle that will be equal to 180 degrees - 55 degrees so 180 - 55 it will be equal to 10 - 57 - 52 one single that will be equal to 1 25° similarly to similarly we can say Y + ab is parallel to CD right ab is parallel to CD and here we do |

02:00 - 02:59 | is a transversal Vidisha Trance versal sogan angle X + angle by angle X + angle b is equal to 180 degrees again reason ko right co interior angles co interior angles angle x is equal to 55 degrees so 55° + Y is equal to 180 degrees so angle why will be equal to 180 - 55 125 degree so x is equal to 50 why is 2125 Z is 125 |

**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.**