missing length. \[ c=\sqrt{[?]} \] Pythagorean Theorem: $a^{2}+b^{2}=c^{2}$ Enter

Step 1 ：Given the Pythagorean Theorem: \(a^2 + b^2 = c^2\)

Step 2 ：We are asked to find the missing length \(c\), so we need to solve for \(c\) in the equation.

Step 3 ：Rearrange the equation to isolate \(c\): \(c = \sqrt{a^2 + b^2}\)

Step 4 ：Now, we can plug in the given values of \(a\) and \(b\) to find the missing length \(c\).

Step 5 ：Finally, we get \(c = \sqrt{a^2 + b^2}\) as the expression for the missing length.

Step 6 ：\(\boxed{c = \sqrt{a^2 + b^2}}\)