Question

Dau coroana va rogggggg​

Answer 1

Explicație pas cu pas:

∢ A = 30°

$AC = 2×BC = 2×12 = 24 \: cm$

$AB^{2} =AC^{2} -BC^{2} =24^{2} -12^{2} = > AB=12 \sqrt{3} \: cm$

a)

$P =BC+AC + AB=12+24 + 12 \sqrt{3} = 36 + 12 \sqrt{3}= 12(3 + \sqrt{3}) \: cm$

b)

$A= \frac{AB \times BC}{2} = \frac{12 \times 12 \sqrt{3} }{2} = 72 \sqrt{3} \: {cm}^{2}$

c) AD ⊥ AC

$AD = \frac{AB \times BC}{AC} = \frac{12 \times 12 \sqrt{3} }{24} = 6 \sqrt{3} \: cm$