Zadanie 1.
a) P = 7 cm • 6 cm = 42 cm2
[tex]b) \: p = \frac{7 \: cm \times 12 \: cm}{2} = \frac{84 \: cm}{2} = {42 \: cm}^{2} [/tex]
Zadanie 2.
[tex]p = 7 \: cm \times 6 \: cm = {42 \: cm}^{2} [/tex]
Zadanie 3.
Pole:
[tex]p = \frac{e \times f}{2} = \frac{6 \: cm \times 8 \: cm}{2} = \frac{48 \: cm}{2} = {24 \: cm}^{2} [/tex]
Obwód:
[tex]obw. = 4 \times a[/tex]
[tex]obw. = 4 \times 5 \: cm = 20 \: cm[/tex]
