The adjacent sides of a rectangle are perpendicular which means they meet a 90-degree angle.

矩形的相邻边是垂直的，这意味着它们相交90度角。

We could put 11 cells in these two corners and fulfill it with just 22 total cells, because adjacent sides share corners.

我们可以在这两个角上放置 11 个单元格， 并且总共只用 22 个单元格来实现它，因为相邻的边共享角点。