Question

Calculati :Aria unui trapez cu lungimile inaltimii de 9 cm si a liniei mijlocii de 11 cm.

Answer 1

linia mijlocie =( B + b) / 2  = 11cm 
aria = ( B + b) · h / 2 = 11cm · 9cm /2 = 99 /2 = cm² = 49,50 cm²

Answer 2

$A= \frac{m+n}{2}*h=11*9=99cm^2$
$\frac{m+n}{2}$ e linie mijlocie