https://cdn.kastatic.org/ka-perseus-graphie/a9d343d7f751c448f22a8129dc2139656049e07c.svg is 1 unit square. https://cdn.kastatic.org/ka-perseus-graphie/bfea6e75590f47d17bfb66bc52352b7dc7bbe2b4.svg Which expressions can we use to find the area of the rectangle?