There are four types of basketball, namely No.7, No.6, No.5 and No.3. ..
No.7 is a men's standard ball, with a weight of 600-650g and a girth of 75-76cm.
No.6 is a standard female ball, with a weight of 5 10-550g and a girth of 70-7 1cm.
No.5 is a youth ball with a weight of 470-500g and a circumference of 69-7 1cm.
No.3 is a children's ball, weighing 300-340g, with a circumference of 56-57cm.
Basketball is a hand-centered physical antagonistic sport, which belongs to the core project of the Olympic Games.
Basketball was invented on June 5438+089 1 Month 65438+February 2 1 by james naismith, a physical education teacher at the YMCA Training School in Springfield, Massachusetts, USA.