A) \[R+r\le 7\]
B) \[{{R}^{2}}+{{r}^{2}}<49\]
C) \[{{R}^{2}}-{{r}^{2}}<25\]
D) \[R-r>5\]
Correct Answer: D
Solution :
Clearly, \[{{r}_{1}}-{{r}_{2}}>{{C}_{1}}{{C}_{2}}\] \[{{r}_{1}}=R,\] \[{{C}_{1}}(3,\,4);\] \[{{r}_{2}}=r;\]\[{{C}_{2}}(0,\,0)\] \[R-r>\sqrt{{{(3-0)}^{2}}+{{(4-0)}^{2}}}\]Þ R ? r > 5.You need to login to perform this action.
You will be redirected in
3 sec