Three circles with centres A, B, C respectively, touch each

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UPPSC 2016 P2 CSAT
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CSAT

89

M: +2.00/-0.66

Three circles with centres A, B, C respectively, touch each other externally. If AB = 5cm, BC = 7cm and CA = 6cm, then the radius of the circle with centre A is:

[UPPSC 2016 P2 CSAT]

A 1.5 cm

B 2 cm

C 3 cm

D 4 cm