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Ans:12.5
Using Pythagoras theorem in the triangle,
[tex]\begin{gathered} \text{Hypotenuse}^2=Base^2+Altitude^2 \\ 16^2=10^2+a^2 \\ 256=100^{}+a^2 \\ 256-100=a^2 \\ 156=a^2 \\ \sqrt[]{156}=a \\ 12.5=a \end{gathered}[/tex]Therefore, length of the unknown leg, a=12.5.