Hey There @Quey11,
[tex] \boxed{13 \text { feet}} [/tex]
Solution
The half-side lengths are 5 feet and 12 feet, the pythagorean theorem will help us solve for the answer.
[tex] 5^{2} +12^{2}= x^2 [/tex]
[tex] 5^2 = 25 [/tex]
[tex] 12 ^ 2 = 144 [/tex]
[tex] 144 + 25 = 169 [/tex]
[tex] c = 169 [/tex]
[tex] x = \sqrt{169} [/tex]
[tex] x = 13 [/tex]