Odpowiedź:
a) P=
[tex] \frac{(3 + 5 + 7) \times 6}{2} = \frac{15 \times 6}{2} = 15 \times 3 = 45 \: {cm}^{2} [/tex]
b) P=
[tex] \frac{(10 + 8 + 8 - 2) \times 10}{2} = 24 \times 5 = 120 \: {cm}^{2} [/tex]
c)P=
[tex] \frac{(8 + 10 + 6) \times 12}{2} = 24 \times 6 = 144 \: {cm}^{2} [/tex]
