Educational video for children to learn what Number Pi is and how we use it. Number Pi is a mathematical constant which indicates the relation between the perimeter and the diameter of a circumference. It's about fitting the diameter as many times as possible into the perimeter of the circumference. We say that it's a constant because number Pi (π) is the same for every circumference in the world, in other words, this number is always equal to 3.14. In this video, the little ones will look at several examples that show Pi is a mathematical constant, through easy and fun calculations. Many architecture, mechanics or engineering projects wouldn't be made possible without number Pi. Thanks for visiting us! If you want your children to smile and learn, subscribe! :D We only upload our own content, designed by educators so that children smile and learn while watching a video. All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning. If you like our videos, download Smile and Learn now. You’ll discover more than 5.000 activities for children aged 3 to 12 yeards, all designed by educators. We have 250 games and interactive stories and over 280 videos in five languages: English, Spanish, Portuguese, Italian and French. Try a month for free and start the adventure!