Odpowiedź:
a) a = 18 cm
ha = 9 cm
[tex]p = \frac{1}{2} \times 18 \times 9[/tex]
[tex]p = \frac{1}{2} \times 162[/tex]
[tex]p = 81cm {}^{2} [/tex]
b) c = 120 mm
hc = 200 mm
[tex]p = \frac{1}{2} \times 120 \times 200[/tex]
[tex]p = \frac{1}{2} \times 24000[/tex]
[tex]p = {12000cm}^{2} [/tex]
c) B = 12 dm
hb = 2,5 dm
[tex]p = \frac{1}{2} \times 12 \times 2.5[/tex]
[tex]p = \frac{1}{2} \times 30[/tex]
[tex]p = 15 {cm}^{2} [/tex]
Pozdrawiam.