r1 and r2 equal to 4 cm and 5 cm are touching each other over a common surface s1s2 (shown in figure). Its radius will be

(a) 4 cm
(b) 20 cm
(c) 5 cm
(d) 4.5 cm
Ans. b
(14)
5/5 - (2 votes)
r1 and r2 equal to 4 cm and 5 cm are touching each other over a common surface s1s2 (shown in figure). Its radius will be

(a) 4 cm
(b) 20 cm
(c) 5 cm
(d) 4.5 cm
Ans. b
(14)
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