Community Tip - Learn all about PTC Community Badges. Engage with PTC and see how many you can earn! X
Когда я учился в школе, мне неправильно рассказывали о параболе.
Нужно было просто показать это видео.
When I was in school, the teacher talked about parabola wrong.
He had only show this video.
Video Link : 6936
Variant 2
Video Link : 6941
