Lines y - y₁ = m (x - x₁) pm a ,√ {1,, + ,,{m^2}} are tangents to same circle . radius o

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10-1.Circle and System of Circles

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The lines $y - y_1 = m (x - x_1) \pm a \,\sqrt {1\,\, + \,\,{m^2}} $ are tangents to the same circle . The radius of the circle is :

A

$a/2$

B

$a$

C

$2a$

D

none

Solution

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Standard 11

Mathematics

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