Gujarati
10-1.Circle and System of Circles
medium

निम्न में से कौनसी रेखा $m$ के सभी मानों के लिये वृत्त ${x^2} + {y^2} = 25$ की स्पर्श रेखा है

A

$y = mx + 25\sqrt {1 + {m^2}} $

B

$y = mx + 5\sqrt {1 + {m^2}} $

C

$y = mx + 25\sqrt {1 - {m^2}} $

D

$y = mx + 5\sqrt {1 - {m^2}} $

Solution

(b) रेखा $y = mx + c$ वृत्त की स्पर्षी होगी यदि,

$c =  \pm {\rm{ }}a\sqrt {1 + {m^2}} $

$\therefore $$y = mx + 5\sqrt {1 + {m^2}} $

Standard 11
Mathematics

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