Odpowiedź:
P∆=
[tex] \frac{a \times h}{2} [/tex]
a)P=
[tex] \frac{3 \times 3}{2} = \frac{9}{2} = 4.5cm ^{2} [/tex]
b)P=
[tex] \frac{3 \times 2}{2} = \frac{6}{2} = 3cm ^{2} [/tex]
