A) 9cm
B) 12cm
C) 15cm
D) 14cm
Correct Answer: B
Solution :
Let the radius of the larger sphere be r cm. Then the radius of other will be (21 - r) cm. According to the equation, \[2\pi r\] \[AOBC=\frac{\theta }{{{360}^{o}}}\pi {{r}^{2}}\]\[\Delta AOB\] \[Arc\frac{\theta }{{{360}^{o}}}\times 2\pi r,\] \[\theta \] \[(\pi =3.14)\] \[={{4}^{2}}-4\times \frac{{{90}^{o}}}{{{360}^{o}}}\times \pi \times {{2}^{2}}=16-4\times \frac{1}{4}\times 3.14\times 4\]
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