id: 06455447
dt: j
an: 2015e.00618
au: Clay, Ellen L.; Rhee, Katherine L.
ti: Circles and the lines that intersect them.
so: Math. Teach. (Reston) 108, No. 5, 376-381 (2014).
py: 2014
pu: National Council of Teachers of Mathematics (NCTM), Reston, VA
la: EN
cc: G40 D80
ut: geometric concepts; geometry; circles; secants; tangents; intersection of
lines and circles
ci:
li: http://www.nctm.org/publications/article.aspx?id=43550
ab: 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)
rv: