Răspuns:
[tex]\boldsymbol {\red{b)20m^2;c)18m^2}}[/tex]
Explicație pas cu pas:
[tex]b) A = \dfrac{(AB+CD) \cdot DM}{2} = \dfrac{(14+6) \cdot 2}{2} = \dfrac{20 \cdot 2}{2} = \bf 20 \ {m}^{2} [/tex]
[tex]c) A = \dfrac{(AB+CD) \cdot DM}{2} = \dfrac{(8+4) \cdot 3}{2} = \dfrac{12 \cdot 3}{2} = \bf 18 \ {m}^{2} [/tex]