A) \[1\sqrt{3}\]
B) \[1\sqrt{2}\]
C) 2/3
D) None of these
Correct Answer: B
Solution :
Images of A about y \[y=x,\]\[y=-2x\] are \[{{A}_{1}}\] and \[{{A}_{2}}\] which lie on BC. Now, \[{{A}_{1}}\equiv (2,1)\] and \[{{A}_{2}}\equiv (-11/5,2/5).\] Equation of BC is \[x-7y+5=0.\] Hence, \[r=ID=\left| \frac{5}{\sqrt{1+49}} \right|=\frac{5}{5\sqrt{2}}=\frac{1}{\sqrt{2}}\]You need to login to perform this action.
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