Odpowiedź:
[tex] \frac{18 \times 6}{2} = 18 \times 3 = 54 {cm}^{2} [/tex]
[tex] \frac{10 \times 3}{2} = 5 \times 3 = 15dm {}^{2} [/tex]
[tex] \frac{50 \times 14}{2} = 25 \times 14 = 350cm {}^{2} [/tex]
Pole trapezu - (a+b)×h/2
