1.
a)
[tex]a \times h = 6 \times 7 = 42 {cm}^{2} [/tex]
b)
[tex] \frac{e \times f}{2} = \frac{7 \times 12}{2} = 7 \times 6 = 42 {cm}^{2} [/tex]
2.
[tex]P = 5 \times 6 = 30 {cm}^{2} [/tex]
[tex]Obw = 2(7 + 5) = 2 \times 12 = 24cm[/tex]
3.
[tex]Obw = 4 \times 5 = 20cm[/tex]
[tex]P = \frac{6 \times 8}{2} = \frac{48}{2} = 24 {cm}^{2} [/tex]
