We are given a right-angled triangle.
Two sides are given and the third side is unknown.
Since it is a right-angled triangle, we can apply the Pythagorean theorem given by
[tex]c^2=a^2+b^2[/tex]Where c is the longest side, a and b are the shorter sides.
For the given case, we are given the longest side and one shorter side.
[tex]\begin{gathered} c^2=a^2+b^2 \\ a^2=c^2-b^2 \\ a^2=14^2-10^2 \\ a^2=196-100 \\ a^2=96 \\ a=\sqrt[]{96} \\ a=9.8 \end{gathered}[/tex]Therefore, the length of the third side is 9.8