Respuesta:
[tex] {20}^{2} = {h}^{2} + {10}^{2} [/tex]
[tex]400 - 100 = {h}^{2} [/tex]
[tex] \sqrt{300} = h[/tex]
[tex] \sqrt{ {2}^{2} \times {5}^{2} \times 3 } [/tex]
[tex] \sqrt{ {2}^{2} } \sqrt{ {5}^{2} } \times \sqrt{3} [/tex]
[tex]2 \times 5 \sqrt{3} [/tex]
[tex]10 \sqrt{3} [/tex]
