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Note that the hypotenuse is side \(q\).

\(\begin{align}
 p^2 + r^2 &= q^2  \\
 \left( {15} \right)^2 + r^2 &= \left( {20} \right)^2  \\
 225 + r^2 &= 400 \\
 r^2 &= 175 \\
 r &= \sqrt {175}  \\
 r &= 13.228... \\
 r &\doteq 13.23{\rm \thinspace{mm}} \\
 \end{align}\)

Note that the hypotenuse is side \(v\).

\(\begin{align}
 u^2 + w^2 &= v^2  \\
 \left( 6 \right)^2 + \left( {10} \right)^2 &= v^2  \\
 36 + 100 &= v^2  \\
 136 &= v^2  \\
 \sqrt {136} &= v \\
 11.661... &= v \\
 11.66{\rm \thinspace{m}} &\doteq v \\
 \end{align}\)