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Find the length of a transverse common tangent of the two circles whose radii are `3.5cm, 4.5 cm ` and the distance between their centres is 10 cm.

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Find the length of a transverse common tangent of the two circles whose radii are `3.5cm, 4.5 cm ` and the distance between their centres is 10 cm.
A. 36 cm
B. 6 cm
C. 64 cm
D. 8 cm
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Correct Answer - B
Length of the transverse common tangent `=sqrt(s^2-(R+r)^2)`.
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