Răspuns :
[tex]\it h = 2,4dm=24cm,\ \ \mathcal{B}+b=560mm=56 cm\\ \\ \mathcal{A}=\dfrac{\mathcal{B}+b}{2}\cdot h=\dfrac{56}{2}\cdot24=28\cdot12=672\ cm^2[/tex]
[tex]\it h = 2,4dm=24cm,\ \ \mathcal{B}+b=560mm=56 cm\\ \\ \mathcal{A}=\dfrac{\mathcal{B}+b}{2}\cdot h=\dfrac{56}{2}\cdot24=28\cdot12=672\ cm^2[/tex]