How well can you calculate the length of a line that surrounds an object? If everything is in order with your spatial thinking and you can easily choose a segment that will surround the figure, we suggest you test yourself. Choose a line of the desired length and make sure it's long enough. The goal is to get as close as possible. Too short, as well as too long line is not accepted. Draw this, you'll have to try first. Once you guess, you can get a new object and try again and again.