This video shows classroom demonstrations to help students learn that the circumference of a circle is a little more than 3 times the diameter. First a hula hoop is used to motivate interest, and then demonstrations are carried out using a tennis ball can and tennis balls. People often memorize many digits in pi, and learn the formula, "pi times diameter equals circumference", without intuitively understanding that the circumference of a circle is a little more than 3 times the diameter.
Tagged under: diameter,circumference,circle,pi,hula hoop,formula,tennis ,tennis balls,class demonstration,intuitive understanding
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