zad 1
[tex]P = \frac{k}{r} \\r = \frac{k}{P}[/tex]
odp C
zad 2
[tex]n = 0,8b\\b = \frac{n}{0,8} = \frac{10n}{8} \\b = 1,25n[/tex]
odp B
zad 3
[tex]P = \frac{1}{2} \times a \times h\\2P = a\times h\\h = \frac{2P}{a}[/tex]
odp D
