Class 9 Maths | Chapter 7 | Exercise 7.4 Q4 | Triangles | NCERT

In this session we will be continuing with the chapter "Triangles".
We will cover Exercise 7.4 Q4 of chapter 7.

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#class9maths #Triangles #learnwithmansi

[sauravsolanki]

in 2nd part
construction :- join AC
then you get 2 triangles ABC and ACD
in triangle ABC
BC > AB ( AB is the smallest side )
<1 > <4 ( angle opposite to greater side is greater) - 1 equation
in triangle ACD
CD > AD
<2 > <3 ( angle opposite to greater side is greater ) - 2 equation
ADDING 1 and 2
<1 +<2 > <4 +<3
<A > < C
HENVE PROVED
HOPE IT IS HELPFUL TO YOU

[sana]

In 2nd part :-
Construction :- join AC
And uh get 2 triangles ∆ABC and ∆ADC
Then..In ∆ABC
AB < BC as given in the ques that Ab is the smallest side..so it will also smaller than BC..
And.. angle opposite to AB side is angle 1..and angle opposite to BC is angle 2..
So, we get
AB < BC
Angle 1 < Angle 2
This is our equation (1)
Now,
In triangle ADC
AD < CD as given in the ques that CD is the longest side..so it will also greater than AD..

And.. angle opposite to AD is angle 3 and Angle opposite to CD is angle 4
So we get..
AD < CD
Angle 3 < Angle 4
It's our equation (2)
Now, ,,, by adding both eq (1) and (2)
By same side vertically...
We get....

Angle1+Angle3 < Angle 2+angle4
We can see in the figure that angle 1 and angle 3 makes Angle 'C'
And Angle 2 and angle 4 makes Angle 'A'

So ur ans is
Angle A > Angle C
Or
Angle C < Angle A
☺️Hope it's helpful☺️

[tanumehta]

construction Join a and c
In triangle ABC and ADC
BC greater than AB
Angle BAC greater than angle BCA(-ANGLE OPPOSITE TO LARGER SIDE IS ONE
DC greater than AD
Angle DAC greater than angle DCA(ANGLE OPPOSITE TO LARGER SIDE IS 2
ADD EQUATION 1 AND 2
ANGLE BAC +ANGLE DAC>ANGLE BCA+ANGLE DCA
ANGLE A>ANGLE C
Hope it will be helpful..

[pallavipallavi]

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[nilkanthvarni]

Mam please make second part video of 7.4 question number mam...

[goldikumar]

Mam aap bahut Achcha padhaati Ho really OMG💍👌👏🙏

[ayushbajpai]

Mam you are the best teacher in the word we can say you without any dout that you are doubtkiller

[JyotiGupta-icsu]

5:16
ye vala ye vla ye vla ye vala 😂😂😂😂

[sheetaljoshi]

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[MalikMalik-uput]

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[adeebaahmad]

Maam you are the best teacher i understand every question 👍👍👍👍👍👍🤗🤗🤗🤗🤗🤗🤗🤗🤗

[divyabhardwaj]

Mam aap bahut accha padha te ho really!! OMG

[gulabsing]

mam please give second part solution also

[Satvik]

You are the best teacher in the world 🌎

[Divyanshuchandel]

Mam you are the best teacher you teach very nicely

[Arjumam]

Maim i have a confusion aap nai phalai likha ad greater than ab and angle 2 joh hai woh ab woh kaisai phir greater than ad confusion hi confusion uh need to
make video for my confusion i am not only person who got 😊 confused i think many students got confused i am i right 👍

[hbrouib]

Mansi mam I needed second part is the solution also mam....😕

[deekshitathakur]

Mam 2nd part of these question is same .l understand very well all questions. I don't understand these questions in my school. I hope all understand these questions.😊😊😊

[cewskdm]

Thanks Mansi mam to teach me very nice

[Sanatanichannel]

Mam thanks you so much ❤❤❤❤❤❤❤❤❤😊😊😊😊😊😊😊🎉🎉🎉🎉🎉