punkty-aleft32right-i-c-sa-przeciwleglymi-wierzcholkami-kwadratu-abcd-a

$\left(9,8\right)$\left(9,8\right)

$\left(15,12\right)$\left(15,12\right)

$\displaystyle \left(4 \frac{1}{2},3 \frac{1}{2} \right)$\displaystyle \left(4 \frac{1}{2},3 \frac{1}{2} \right)

$\left(3,3\right)$\left(3,3\right)