0.0057
Rounded to three significant figures, 38/6724 = 0.00565
It would have been far quicker and simpler to use your calculator. But since you seem to be unwilling to make that effort, the answer is 176.9
82. 82 x 82 = 6724.
The square root of 6724 is 82
The square root of 67.24 is 8.2
51 divided 38 = 1.3421052631578947
1.9
53
17
2
38
0.6786
54
0.0045