Question

Punctul 2 ,am nevoie urgent sunt la teza.

Answer 1

$cos = \frac{cateta alaturata}{ipotenuza}$

$cos B = \frac{AB}{BC}$

$\frac{3}{5} = \frac{AB}{10}$

$AB = \frac{30}{5} \\AB=6$

$BC=10\\T. Pitagora$=> $AB^{2} +AC^{2} =BC^{2}$

$6^{2}+AC^{2}=10^{2}$

$36+AC^{2} =100$

$AC^{2} =100-36=64\\AC=\sqrt{64} \\AC=8$

$aria =\frac{cateta1*cateta2}{2} \\aria=\frac{AB*AC }{2} \\aria= \frac{6*8}{2} \\aria = \frac{48}{2} \\aria = 24$