Millimeter paper is not always easy to find. Why don’t you save yourself the trouble and print it directly here?
How do you measure an angle? The easiest way is to have your protractor on hand. Download for free this 180° protractor in pdf format.
Learn how to form a square with this free worksheet.
For anyone in need of teaching kids how to learn to form a Circle, for example, parents homeschooling, this worksheet will be a big asset.