__________
[tex] \: [/tex]
b² = c² - a²
b² = 10² - (√19)²
b² = 100 - 19
b² = 81
b = √81
b = 9
Use Pythagorean theorem
[tex]\\ \sf\longmapsto P^2=H^2-B^2[/tex]
[tex]\\ \sf\longmapsto P^2=10^2-(√19)^2[/tex]
[tex]\\ \sf\longmapsto P^2=100-19[/tex]
[tex]\\ \sf\longmapsto P^2=81[/tex]
[tex]\\ \sf\longmapsto P=9[/tex]
