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The Circle Approach to Trigonometry

Kevin C. Moore and Kevin R. LaForest

A connected introduction of angle measure and the sine function entails quantitative reasoning.

Journal Article

Cover The Mathematics Teacher

In The Mathematics Teacher Volume 107 (2014): Issue 8 (Apr 2014)

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Multiple Proof Approaches & Mathematical Connections

Zhonghong Jiang and George E. O'Brien

Using technology to explore the Three Altitudes of a Triangle problem, students devise many proofs for their conjectures.

Journal Article

Cover The Mathematics Teacher

In The Mathematics Teacher Volume 105 (2012): Issue 8 (Apr 2012)

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Delving Deeper: Boundaries in Higher Dimensions and Their Kinship with Combinatorics

Kate Nowak

This is a description of a collaborative investigation by mathematics teachers into the numbers of dimensional boundaries for n > 2. Functions are fit to the patterns observed, and a relationship to Pascal's triangle is noted.

Journal Article

Cover The Mathematics Teacher

In The Mathematics Teacher Volume 105 (2011): Issue 5 (Dec 2011)

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What's Inside the Cube? Students' Investigation with Models and Technology

Samuel Obara and Zhonghong Jiang

Applying Zometool, vZome software, and The Geometer's Sketchpad to tetrahedrons nested in cubes enhances students' spatial visualization skills.

Journal Article

Cover The Mathematics Teacher

In The Mathematics Teacher Volume 105 (2011): Issue 2 (Sep 2011)