1.daca stim toate laturile vom calcula aria cu formula lui Heron:
[tex]A= \sqrt{p(p-AF)(p-BC)(p-BE)} = \sqrt{5*1*2*2}= 2\sqrt{5} m^{2} [/tex]
p=P/2=(4+3+3)/2=5
2.
[tex] \frac{5}{6} - \frac{1}{7}*(- \frac{7}{4}) = \frac{5}{6}+ \frac{1}{4} = \frac{10+3}{12}= \frac{13}{12} [/tex]