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.