Question

un trapez cu inaltimea de 8 cm si lnia mijlocie de 10 cm are aria egala cu ...cm²

Answer 1

$A_{tr}= \frac{(b+B)*h}{2}= \frac{b+B}{2}*h \\ lm= \frac{b+B}{2} \\ deci:A_{tr}=lm*h=10cm*8cm=80 cm^{2}$

Answer 2

$A_{trapez}=l_m*h$$=8*10=80cm^2$