https://cdn.kastatic.org/ka-perseus-graphie/cf1bd91baa66c66cb18a1aa62c8fc168e2b37f7d.svg is 1 unit square. https://cdn.kastatic.org/ka-perseus-graphie/80744f104cf8191a40b10c4fb7fd62a47e29faa4.svg Which expressions can we use to find the area of the rectangle?