A) 1
B) \[\sqrt{0.11}\]
C) \[\sqrt{0.01}\]
D) \[\sqrt{0.39}\]
Correct Answer: B
Solution :
\[\widehat{A}\,\,=\,\sqrt{{{(0.5)}^{2}}\,+\,{{(0.8)}^{2}}+{{c}^{2}}}\,\,=\,\,1\,\] \[c=\sqrt{0.11}\]
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