We can plug the two points into the distance formula.
[tex]\sf~d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]
(0, 6), (5, 12)
x1 y1 x2 y2
Plug in what we know:
[tex]\sf~d=\sqrt{(5-0)^2+(12-6)^2}[/tex]
Subtract:
[tex]\sf~d=\sqrt{(5)^2+(6)^2}[/tex]
Simplify the exponents:
[tex]\sf~d=\sqrt{25+36}[/tex]
Add:
[tex]\sf~d=\sqrt{61}[/tex]
Simplify the square root:
[tex]\sf~d\approx\boxed{\sf7.81}[/tex]