Question

am nevoie urgent va rog ​

Answer 1

Răspuns:

b) 30°

Explicație pas cu pas:

ΔDBA~ΔABC => ∢DAB≡∢ACB

$\cos \measuredangle DAB = \dfrac{AD}{AB} = \dfrac{6}{4 \sqrt{3} } = \dfrac{ \sqrt{3} }{2}$

$\measuredangle DAB = 30 ^{0} \implies \measuredangle ACB = 30 ^{0}$