radius

the st lines 12x-5y-17=0 and 24x-10y+44=0 are tangents to the same circle.Then the radius of circle is ??

1 Answers

the two lines are

12x - 5y - 17=0

12x - 5y + 22 = 0

There are diagonally opposite .. so the distance between them will give the answer =

(|12 + 5 + 22| / (12² + 5²))

= 3

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