Question

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

Answer 1

$s = frac{ah}{2}$

$s = frac{AB times CK}{2}$

$s = frac{9 times 8}{2} = 36$

$h = frac{2S}{a}$
$BD = frac{2S }{AC} = frac{2 times 36}{14} ≈ : 5.1$