Questions
The angle between two tangents drawn from
the origin to the circle is
detailed solution
Correct option is C
The equation of any line through the origin ( 0, O) isy=mx If it is a tangent to the circle (x−7)2+(y+1)2=52 then, 7m+1m2+1=5⇒(7m+1)2=25m2+1⇒24m2+14m−24=0This equation, being a quadratic inm, gives two values ofm, say m1 and m2 . These two values of mare the slopes of the tangents drawn from he origin to the given circle. From (i), we have m1m2=−1Hence, the two tangents are perpendicular Hence, the two tangents are perpendicular(x−7)2+(y+1)2=50 of the given circle. Hence, required angle is π/2Talk to our academic expert!
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