Maths Circles part 7 (Numerical : chord length) CBSE class 9 Mathematics IX

Maths Circles part 7 (Numerical : chord length) CBSE class 9 Mathematics IX

[devimahesh]

examfear you did great...
i understood the
but small mistakes....
love you EF

[Slowedsongsking]

sir in circle numericals of 10.3 q 1 how did you get the equation and that 8

[Slowedsongsking]

nice i understand a lot but can i ask doubt if any

[wildrose]

Guys, This is how 8x came :
3² - (4-x)²
now actually (4-x)² is in the form (4-x) (4-x)
So, 9 - (4-x) (4-x)
9 - 16(4x4=16) - 4x {4 x (-x)} - 4x {4 x (-x)} + x² { (-x) x (-x) }...we know that - - = + ...So that's y it became x² & not -x²
So it's now 9 - 16 - 4x - 4x + x²
9 - 16 -8x + x² { -8x came bcoz -4x -4x = -8x}
there was few mistakes in the video but that's alright
So now 25 - x² = 9 - 16 - 8x + x²
8x will go to the other side so it'll become positive.
8x = 25 + 16 - 9
8x = 32
x = 32 ÷ 8
x = 4...then watch the video

[honeydaksh]

sir, thanks its rally helpfull for me

[bhuvneshagg]

Sir in 2nd question we can see by construction that the common chord is passing through the center of the smaller circle so sir we can say that the length of common chord is 3cm

[vishalkrishnan]

Sir good explanation but 2nd answer is a little complicated

[shantanuthakur]

Great work Mrs. Roshni and teachers!!!IM ur big fan and will; surely donate big amount when i grow and get a job!BUt can u juzt add history and civics history atleast!

[rohitmanimaran]

sir in numerical 3cm and 5cm with 2 common points the equation (4-x)^2 is 16+x^2-8x, but you have done 16-x^2+8x which is wrong

[PreetiKumari-kwdq]

1:01.. can anyone also listen that scary background voice...what was that...😥

[prabavathiganesan]

How to get study material from exam fear. com

[sugandhyshaju]

dnt undrstnd prprly..roshni mam shud exaplain these