The equation for a right triangle is [tex] a^{2} + b^{2} = c^{2} [/tex]
The missing side length can either be (a) or (b) it doesn't really matter, but the hypotenuse is always (c)
It'll be (a) in this
[tex] a^{2} +24^{2} = 26^2[/tex]
[tex] a^{2} +576=676[/tex]
[tex] a^{2} =100[/tex]
square root both sides:
[tex] \sqrt{a^{2} } = \sqrt{100} [/tex]
[tex]a=10[/tex]
10m is the missing length