A) \[\frac{PQ+PR+QR}{3}\]
B) \[\frac{PQ+PR}{3}\]
C) \[\frac{PQ+QR}{3}\]
D) \[\frac{PR+QR}{3}\]
Correct Answer: B
Solution :
[b] \[{{x}_{cm}}=\frac{1\times 0+1\times PQ+1\times PR}{1+1+1}=\frac{PQ+PR}{3}\] And \[{{y}_{cm}}=0\]
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