Răspuns:
a) Aria este
[tex] \frac{32 \times 80}{2} = 32 \times 40 = 1280 \: mm {}^{2} [/tex]
b) Aria este:
[tex] \frac{ \sqrt{3} \times 3 \sqrt{3} }{2} = \frac{3 \times 3}{2} = {4.5mm }^{2} [/tex]
c)
[tex]3 \sqrt{2} + \sqrt{2} = 4 \sqrt{2} [/tex]
Aria este:
[tex] \frac{4 \sqrt{2 } \times 3.5 \sqrt{2} }{2} = 2 \times 3.5 \times 2 = 14cm {}^{2} [/tex]
