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  4. Find the length of a transverse common tangent of the two circles whose radii are 3.5 cm , 4. 5 cm and the distance between their centres is 10 cm.

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Q. Find the length of a transverse common tangent of the two circles whose radii are $3.5\, cm , 4.\, 5 cm$ and the distance between their centres is $10 \, cm$.

Geometry

Solution:

Length of the transverse common tangent $=$ $\sqrt{d^2-(R+r)^2}$