Question

Two circles with centers a and b of radii 3 cm and 4 cm res , intersecting at two points c and d such that ac and bc are two tangets of the circles, then length of common chord .
how can a line though the center (ac) be a tangent to the circle?
IT IS TANGENT TO OTHER CIRCLE.


Hmmm. OK. In that case, the two circles must be orthogonal to each other. That is, if you draw triangle acb and adb, each is a 3-4-5 right triangle. The common chord is just twice the altitude to the hypotenuse, which I'm sure you can find.

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