Question

se da triunghiul ABC dreptunghic, a=90°, AB=5 CM , AC=12 CM. SE cere: a)BC; b)Aria triunghiului ABC
URGENT
PANA MAINE VA ROG
DAU COROANA​

Answer 1

Răspuns:

a) teorema lui pitagora:

${c1}^{2} + {c2}^{2} = {i}^{2}$

c1=cateta 1(AB)

c2=cateta 2(AC)

i=ipotenuza(BC)

${ab}^{2} + {ac}^{2} = {bc}^{2}$

${5}^{2} + {12}^{2} = {bc}^{2}$

$25 + 144 = {bc}^{2}$

$169 = {bc}^{2}$

$bc = \sqrt{169}$

$bc = 13$

b) A=

$\frac{c1 \times c2}{2}$

A=

$\frac{ab \times ac}{2}$

A=

$\frac{12 \times 5}{2}$

A=

$30 {cm}^{2}$