To apply the Pythagorean Theorem \( a^2 + b^2 = c^2 \), where \( c \) is the hypotenuse (the longest side of the right triangle) and \( a \) and \( b \) are the lengths of the other two sides, you need to provide the lengths of the two known sides and specify which side you want to find.
However, since you've only provided responses without any known side lengths or a specific triangle configuration, I cannot calculate an exact unknown side length directly.
Please provide the lengths of the two known sides or specify which side you want to find, and I’d be glad to help!