The distance between the centra of two equal circles, each of radius 3 cm, is 10 cm. The length of a transverse common tangent is

The distance between the centra of two equal circles, each of radius 3 cm, is 10 cm. The length of a transverse common tangent is
1). 8 cm
2). 10 cm
3). 4 cm
4). 6 cm

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