It's time to practice, look at the picture of the caution sign above. It's in the shape of a diamond. How many sets of parallel lines do you see?
If you guessed two sets, you are exactly right. If we rotate the diamon on it's side, it becomes a square. A square has two sets of parallel lines. The hortizonal set and the vertical set.
This Math is Fun website has more information about parallel lines and the angels that parallel lines form.
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