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Angle Bisectors (Part I)
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In this video, we discuss about the basics of the angle bisectors and how to find out them along with the homework from the previous video.

Sachin Rana is teaching live on Unacademy Plus

Sachin Rana
IVth Year UG, IIT Bombay | YouTuber (143k subs) | Mentored 3 under 100 ranks in JEE Advanced | No. 1 educator for Organic Chemistry

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(8)
U
Unacademy user
very important knowledge mam, very nice. thank you mam.
There are two possible lines for the third side : 3x+y+2=0 for m=-3 and x-3y+4=0 for m= 1/3.
Sachin Rana
a year ago
Yes, correct. Good.
Jessica Gulati
a year ago
Plz can you tell me that how angle bisector between the two lines can be third side
Jessica Gulati
a year ago
Plz help me I'm not getting the question
I had not used the angle bisector method.. use the formula that uses slope of two lines to find the angle between them.. from there you get two values for slope
Angle between the first side and the third side and the angle between the second side and the third side will be the same as it is an isosceles triangle. Equate the two once with a plus sign and once by a negative sign as it is the modulus which we caculate hence two values.
Jessica Gulati
a year ago
Thank u ☺️☺️☺️
Anytime:-)
Praveen Singh
a year ago
thanks
Welcome ☺️
Praveen Singh
a year ago
ur able to solve so fast
Thanks.. I love some of the topics of maths but at some I'm really weak like hyperbola.. not at all good at that 😅
Praveen Singh
a year ago
u should just see to it that who question is fooling u
Praveen Singh
a year ago
can u tell me how u understand question tricks so well
Maths is all about practice.. you will yourself develop your shortcuts (TBH I just try to avoid lengthy calculations as much as I can). Also refer to the test series available.
Praveen Singh
a year ago
thanks for help u girl
Praveen Singh
a year ago
I am boy not man
Praveen Singh
a year ago
oh sorry
It's ok.. BTW good luck for all your upcoming tests.
Praveen Singh
a year ago
to u also but it name
Praveen Singh
a year ago
no ur name I mean
Praveen Singh
a year ago
okay
Praveen Singh
a year ago
do u use social media
Praveen Singh
a year ago
do you use social media
Praveen Singh
a year ago
yes very nice ur full focus to be all india rank one
Haha.. thanks.. hoping the same for you too ;-)
Praveen Singh
a year ago
you are more intelligent then me
Praveen Singh
a year ago
u to
Praveen Singh
a year ago
bye
Praveen Singh
a year ago
all the best to face the world
Praveen Singh
a year ago
can we be friends u solve doubt and I will help u in understanding trick question
Praveen Singh
a year ago
thanks
Welcome ☺️
Praveen Singh
a year ago
who to calculate mole concept
Praveen Singh
a year ago
hi
Praveen Singh
a year ago
thanks
"Angle between the 1st side and 3rd side and the angle between the 2nd side and 3rd side will be the same", how do you know that? Why can't the angle between 1st and 2nd side and angle between 2nd and 3rd side be equal? I think your case is only valid when the angle between the two given lines is >90°.
two given lines in the question is >90°, but I calculate it and it's close to 50°. Do you have some explanation on how you decided that those angles would be the only one that are equal?
Goddamit I didn't see that two equal sides are given in the question. How on earth do you delete comments here, what the heck.
sachin sir i solved the hw question by simply letting the slope of the line to be 'm' As we know that two lines are equally inclined with the third line ( which we have to find ) so i just find the tan of angle between both of them and equate so i got two condition one is impossible as m = iota so by other condition i got the equations which are same as yours
bhaiya in homework question, we can also do by equal angle method na ? as angle B and angle C are equal we can find the slopes of line BC and can form the equation.
bhaiya which course you are going to take after this?
Sachin Rana
a year ago
Circles.
Bhargav Gohil
a year ago
okay ... Thanks Bhaiya
x-3y+4=0 for m=1/3 and x+2y-1=0 for m=-1/2
Sachin Rana
a year ago
It's incorrect
Jessica Gulati
a year ago
Plz tell me that how angle bisector of two lines can be third side
Jessica Gulati
a year ago
I'm not getting the question plz tell me
Draw the figure, you will see the angle subtended by the third(unknown) side is the same as half of the obtuse angle between the two lines given in the question (by alternate angles property).
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