Can someone pls help me out?

Using Pythagorean theorem
[tex]\\ \sf\longmapsto H^2=P^2+B^2[/tex]
[tex]\\ \sf\longmapsto H^2=11^2+6^2[/tex]
[tex]\\ \sf\longmapsto H^2=121+36[/tex]
[tex]\\ \sf\longmapsto H^2=156[/tex]
[tex]\\ \sf\longmapsto H\approx12.33[/tex]