I think thats the right angled triangle
as u can see the symbol of right angle
So...
U can use Pythagoras theoram in this to find length
6.2 ² + x² = 7.27²
x² = 7.27² - 6.2²
x² = 52.8529 - 38.44
x² = 14.4129
x = 3.796
If its not a right angled then by surface area and volume u could find length..