If the angle between tangents drawn to $x^2+y^2+2 g x+2 f y+c=0$ from $(0,0)$ is $\frac{\pi}{2}$, then

JEE MATHEMATICS MCQ: CIRCLES

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Application +4 | -1

If the angle between tangents drawn to

x^2+y^2+2 g x+2 f y+c=0

from

(0,0)

\frac{\pi}{2}

, then

View answer and explanation

Correct option: B

g^2+f^2=2 c

Option B (

g^2+f^2=2c

) is correct because it represents the condition for the angle between tangents from (0,0) to be

\frac{{\pi}}{{2}}

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{\left( {{\alpha ^2}{x^2} - 2\alpha \mathrm{ }x + 1} \right)^{51}},

x

\left( {\alpha ,2{\alpha ^2}} \right)

{x^2} + {y^2} = 4,

{x^2} + {y^2} - 2x + 4y - 4 = 0

{x^2} + {y^2} = {a^2}

\left( {{x_1},{y_1}} \right)

\quad \alpha, \beta

\gamma

P, Q

x^2+y^2=1

A

(-1,0)

A P, A Q

A R

G P

\cos \alpha / 2, \cos \beta / 2

\cos \gamma / 2

x+y=6

x+2 y=4

x+y=5

x-y=1

9 \pi