TIP However you should be aware of that it can be a little difficult to put one line so that it is perpendicular to the second line If you want to make sure that your triangle is retvinklet then you should use the next method method 2

Could you correct the punctuation please?
TIP! However, you should be aware of, that it can be a little difficult to put one line, so that it is perpendicular to the second line,. If you want to make sure, that your triangle is retvinklet, then you should use the next method (method 2).