https://cdn.kastatic.org/ka-perseus-graphie/bc67f4f0e4d41e9098b84a93e5fcfbef2cda7d8e.svg is 1 unit square. https://cdn.kastatic.org/ka-perseus-graphie/d59fdb0f5d4e3c3726353daa2b8a022394122f70.svg Which expressions can we use to find the area of the rectangle?