[tex]ad = ae - de \: = > ad = 15 - 6 = 9 \: cm \: = > \: abcd = dreptunghi \\ad = bc = 9 \: cm \: \\ ba = cd \: = > cdef = dreptunghi \\ cf = de = 6 \: cm \\ cd = fe = 9 \: cm[/tex]
[tex] = > ba = cd = 9 \: cm \: = > abcd = \: patrat \\ ab = bc = cd = ad = 9 \: cm[/tex]
[tex]a) \: aria = {l}^{2} > = > {9}^{2} = {81m}^{2} [/tex]
[tex]b) \: aria {}^{cdep} = l \times l = > {a}^{adef} = > 9 \times 6 = > {a}^{cdef} = {54m}^{2} [/tex]
[tex]10t = 10.000 \: kg \\ {54m}^{2} = 0.0054 \: ha[/tex]
[tex]1 \: ha.......10.000 \: kg \: \\0.0054 \: ha........... - \: ha \\ x kg = \frac{0.0054 \times 10.000}{1} = 54 \: kg[/tex]