Teacher: Who wants to start? Start.
Student1: Okay, well, the diameter. If you multiply that by 3.14 you'll get the circumference
Student1: Okay, well, the diameter. If you multiply that by 3.14 you'll get the circumference
Student1: of the circle, and if you divide that number by 2, that equals the radius.
Teacher: Okay, that's enough, it's only fair. Let's give Stu2 a chance.
Student2: Yeah, and if you multiply the radius times pi, you'll get the area of the circle,
Student2: yeah, the circle.
Teacher: The radius times pi, okay.
Student3: I think, what was the term you gave that?
Teacher: The area.
Student3: The area, it's radius squared times pi.
Teacher: Oh, remember those squares.
Student4: Yeah, radius-squared times pi... yeah, 'cause there's...
Teacher: How many squares were there that fit into the circle? How many?
Student2: Four.
Teacher: Evenly?
Student1: No, three and a little.
Teacher: Three and a little. Remeber when we were standing up here holding them up?
Teacher: All those little pieces that we cut up? We didn't fit a whole 4. We got three whole ones,
Teacher: and then there was a little strip left over. So we would have needed three
Teacher: and a little more of one of those radius squares to fit in. And what do we know
Teacher: about that number that's 3 and a little bit more? It has a name. What's the name?
Student: Pi.
Teacher: Okay. All right. What else did you learn about circles? Anything else?
Student5: How to find the circumference. If you wrap a string around the circle,
Student5: you can then take the string and measure it, and then you have the circumference.