Q.

Area of triangle formed by common tangents to the circle x2+y2-6x=0 and x2+y2+2x=0 is

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a

33

b

23

c

93

d

63

answer is A.

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Detailed Solution

A divides C1C2 externally in the ratio 1:3 . The external center of similitude is P,  it divides C1C2  in the ratio r1:r2 externally. externally. Hence, P−3,0Suppose that the angle between the direct common tangent is θtanθ2=rS11=13θ2=30°Equation of tangent from A−3,0  is a line making an angle 30°  with x− axis and passing through the point −3,0Equation of tangent is x+3=3yit cuts the transverse common tangent x=0  at 0,3Therefore, the vertices of the required triangle are 0,3.0,−3,−3,0Hence the area of the triangle is 33 square units
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