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\frac{2\sqrt{7}}{\left(\sqrt{7}\right)^{2}}\approx 0.755928946
Rationalize the denominator of \frac{2}{\sqrt{7}}\approx 0.755928946 by multiplying numerator and denominator by \sqrt{7}\approx 2.645751311.
\frac{2\sqrt{7}}{7}\approx 0.755928946
The square of \sqrt{7}\approx 2.645751311 is 7.