
06455447
j
2015e.00618
Clay, Ellen L.
Rhee, Katherine L.
Circles and the lines that intersect them.
Math. Teach. (Reston) 108, No. 5, 376381 (2014).
2014
National Council of Teachers of Mathematics (NCTM), Reston, VA
EN
G40
D80
geometric concepts
geometry
circles
secants
tangents
intersection of lines and circles
http://www.nctm.org/publications/article.aspx?id=43550
Summary: In this article, the authors use the mathematics topic of circles and the lines that intersect them to introduce the idea of looking at the single mathematical idea of relationships  in this case, between angles and arcs  across a group of problems. They introduce the mathematics that underlies these relationships, beginning with the questions asked, the tools used, and the language used in that process to talk about the mathematics. The authors challenge readers to begin drawing visuals and practice talking about these relationships in ways that create a connected web of mathematical ideas rather than problems to be solved. (ERIC)