Дано: ΔABC. AB = 9 см, CK = 8 см, AC = 14 см, BD ⊥ AC. CK ⊥ AB. Найти BD.

[tex]s = \frac{ah}{2} [/tex]

[tex]s = \frac{AB \times CK}{2}[/tex]

[tex]s = \frac{9 \times 8}{2} = 36[/tex]

[tex]h = \frac{2S}{a} [/tex]
[tex]BD = \frac{2S }{AC} = \frac{2 \times 36}{14} ≈ \: 5.1[/tex]