# Angles in Geometry – CBSE Maths Lesson for Class V

[ Music] hello everybody let’s start a new assembly inclinations now first of all let’s try and understand slants and angle frequently are comprised of two arms and a vertex now here if we learn we have arm VA and on VC and a common vertex now here this quality P is our vertex because it is the common degree hence the inclination is degree measure between two limbs having a common vertex so this is this arc becomes our inclination now here if we ensure inclinations are often denoted by a degree measure like 15 stages 30 grades and so on[ Music] now we come forward two types of angles we have various varieties of angles you assure acute tilts obtuse tilts right tilts straight-from-the-shoulder angle reflex inclinations end directions there are huge types of angles let’s discuss them one by one first of all we have acute angle the smallest form of angle an angle whose measuring is between 0 unit and a 90 measure is called acute end for example let’s make now here if we attend two limbs are at an tilt of less than 90 severity here it’s only 30 measures there for such an tilt of 30 degree measure is called an acute angle next we come to obtuse angle an slant whose criterion is between 90 grades and 180 units is called and obtuse angle take for example here the two arms of this angle are at an angle more than 90 stages it is 150 measures therefore 100 degree 150 measures is an obtuse angle next we come to right angle an tilt whose appraise is exclusively and exclusively 90 positions merely is called a right angle and here if you realize two weapons are vertical to each other we too announced right tilts as two cables or two appendages making an angle of 90 degree and are perpendicular to one another 90 -degree angle is usually denoted by two fronts which are perpendicular to each other next we come to straight angle here straight angle is an angle about the site whose quantify is accurately 180 severities now if you see this life what we are basically doing is at an out moment a if you picture the degree measure around timing you have to measure the angle around site a you start from here you go till this side it’s a straight line straight line is always at an direction of 180 magnitudes delight remember straight line is an angle measure of 180 positions hence angle around Point a is 180 degrees reflex slants now these are very important inclinations because students generally forget what our reflex tilts and angle whose measure is greater than 180 units but lesser than 360 stages here we have two constraints one is greater than 180 and furthermore little than 360 measures now here if you meet there are currently two on we are not making this angle piece see this we are not making this small angle between the two on what we are looking forward to is the other angle the greater angle realized between the two limbs that is the outer angle this angle is known as reflex inclinations now if you see this is greater than 180 but less than 360 this is somewhere around you save 280 stages therefore this laser shows and[ Music] next we move over to complete angle and slant whose measuring is 360 magnitudes that is you start from a site and you contact that detail early for example if we start running in a ballpark now from the part where we start and when we come to that target again we say we have completed one put that one round is of measure 360 unit same method if you participate at this object I started making an angle at this extent from here and I came in a circular path and I stopped now starting and the ending moment both are the C hence this is a ended tilt with measure of 360 units next we move forward to complementary angles now try and understand them very carefully a pair of angles whose sum is 90 severities those are known as basically complementary for example here if we encounter we have two slants one is of 60 position evaluate and other is of 30 unit Majer if you include both the tilts of Natal angle a is similar to 60 grade and slant b is equal to 30 degrees what we get is 90 degrees which is a sum if we get that we say angle a and slant B are complementary angle remember these slants can be adjacent tilts as well oh these inclinations may or may not be this is an angle it is not a definite regulation[ Music] second supplementary angles pair of directions whose sum is 180 when I say pair delight be reminded that makes merely two directions don’t take five don’t take seven don’t take three duet of tilt represents pair only two tilts are stood at that time whose value is 180 grades now here if you meet angle C is making an angle Point C here we have angle one one zero magnitudes angle D “were having” 70 severities so if we supplement C and D we get what 110 Plus 70 which is 180 severities therefore we can say that angle C and angle D are what a form a duo of supplementary angles next we move forward to linear pair what is a linear pair a duo where non-common weapons flesh a straight line or at an slant of 180 severities are called linear pair that implies if you have non-common limbs angle of 180 magnitudes it is clearly understood that the inclinations will be forming a sum of money getting take for example now now “were having” two inclinations angle a D C and direction D D C not envision very carefully D is the common detail common vertex of both these inclinations common arm of both the directions is what DC non-common arm is a D and D be I here road non-common forearms are at angle of 180 here if you determine a D and D B is forming a straight line if you assure handiwork very carefully it is forming what straight like voodoos of an angle fund to do if such a case originates that is understood that angle ADC plus inclination B DC are likely to be having a sum of 180 grades now here if you accompany also we come to know that 110 plus 70 years 180 magnitudes but why because of the condition that ad and BD which are non-common weapons are at an angle of 180 degrees such a pair of inclinations is announced linear duo I hope you understood the castigate on triangle see you soon with the next exercise on pair of rows thank you