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

$\boxed{c = \sqrt{a^2 + b^2}}$

Steps

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 ：$\boxed{c = \sqrt{a^2 + b^2}}$