Question

ajutati maaaa ex 7....​

Answer 1

Stim ca AD este mediana in triunghiul ABC

Mediana imparte Aria in doua arii egale.

Fie d(D,AC)=E

Aria unui triunghi:

$A=\frac{b\times h}{2}$

a)

$A_{ABC}=2\times A_{ADC}$

$A_{ADC}=\frac{DE\times AC}{2}=\frac{8\times 12}{2}=48\ cm^2$

$A_{ABC}=2\times 48=96\ cm^2$

b)

$A_{ADB}=48=\frac{h\times AB}{2}\\\\ h=96:16=6\ cm$