Equation of normal line | Derivative applications | Differential Calculus | Khan Academy

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Differential calculus on Khan Academy: Limit introduction, squeeze theorem, and epsilon-delta definition of limits.

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[alishafranke]

Oh! So the normal line is perpendicular to the tangent line. Thank you so much for your help!

[daannoelmentink]

Luv you long time Khan. Saved my life many of times

[KevinS]

watch the video at speed 1.25x or even 1.5x if you can, much better.

[straxescraft]

can someone tell me why do we need to find the normal and tangent lines? why do we need them, as in the purpose. Thank you.

[CreativiTimothy]

Why is a normal line perpendicular to a tangent line? I don't want to accept that "that's the way it is". Why is it called normal?

[jezsorizardo]

i have question. for the eq.
x^2+y^2=(2X^2+2y^2-x)^2
@ point (1/2, 0)? the y'=-1/0. what is the tangent and normal line? pls. reply sir. thanks☺.