A) \[2:7\]
B) \[7:2\]
C) \[3:7\]
D) \[7:3\]
Correct Answer: B
Solution :
Let\[\frac{a}{3}=\frac{b}{7}=\frac{c}{8}=k\] (say) \[\therefore \] \[s=\frac{18}{2}k=9k\] \[\therefore \] \[\frac{R}{r}=\frac{abc}{4\Delta }.\frac{s}{\Delta }=\frac{s.abc}{4{{\Delta }^{2}}}\] \[=\frac{9k.168{{k}^{3}}}{4.9k.6k.2k.k}=\frac{7}{2}\]You need to login to perform this action.
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