To estimate the value of \( 6 \times \sqrt{2} \), we first find an approximate value for \( \sqrt{2} \).
The square root of \( 2 \) is approximately \( 1.414 \). Now, we can calculate:
\[ 6 \times \sqrt{2} \approx 6 \times 1.414 \approx 8.484 \]
Among the choices given, the best estimate for \( 6 \times \sqrt{2} \) is:
○ 8.4