Two circles with centers P and Q of radii 7 cm nd 3 cm, respectively, – McqOptions

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1.	Two circles with centers P and Q of radii 7 cm nd 3 cm, respectively, touch each other externally at a point A. BC is a direct common tangent to these two circles where B and C are the points on the circles respectively. The length of BC is:
A.	\(\sqrt{21}\) cm
B.	3\(\sqrt{21}\) cm
C.	2\(\sqrt{21}\)cm
D.	4\(\sqrt{21}\)cm
Answer» D. 4\(\sqrt{21}\)cm

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