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A Northern Light Circle Problem
 
In this note Gregory describes a problem involving Dasher and Dancer moving around a Northern Light Circle.
A Rise over Run, and a 10 versus 1
 
A diamond slope, or the slope of the angle bisector, is considered in this note as a generalization of two well-known slope relationships. This general approach is compared then with well-known approaches using various examples.
An Arc Midpoint Computation Lesson
 
In this note the authors give an expression for locating the midpoint of a circular arc and a calculator for determining the midpoint.
An Arc Midpoint Computation Proof
 
In this note the authors give an proof of the expression for locating the midpoint of a circular arc that was given in his note with Gregory V. Akulov.
Arc Midpoint Algorithm
 
Gregory and Oleksandr have built on the arc midpoint resource and the proof of the arc midpoint formula by constructing an algorithm for finding the coordinates of the midpoint. It is hoped that teachers of high school Mathematics and Computer Science will use these resources to enrich the teaching and learning in both subject areas.
Complex Numbers
 
This note is a response to a teacher's request for an explaination of i squared and the square root of i that would be appropriate for secondary level students.
Deriving the Slopes of the Angle Bisectors
 
In this note Gregory uses a trig identity to develop an expression for the slopes of the angle bisectors of two lines in terms of the slopes of the lines that form the angle.
Diamond Slopes and Speedy Whales via… One Identity
 
A trigonometric identity is used to develop a formula for the slope of a rhombus diagonal. This expression is then used to find the velocity of a whale.
Direct and Partial Variations (HTML or PDF)
 
A unit on direct and partial variation that can be taught after the introduction of linear functions.
Friezing at Washington State University
 
This article is part of the Mathematics Notes series at Washington State University. In the article, Judi and Harley start by determining the functions that map the plane back onto itself, while at the same time, mapping a specified line back onto itself and preserving the size and shape of any objects represented in the plane. These are the functions that preserve frieze patterns. The authors then look at the algebraic structure of this collection of functions under the operation of composition, show that there are only seven frieze groups, and illustrate how they are generated. Each frieze group is represented algebraically and geometrically. The article concludes with a tour of the Washington State University campus, looking at the ways in which frieze groups are exhibited and used in our immediate surroundings.
Making the Connection: Patterns and Relations
 
This one of the articles in the seventh edition of Ideas and Resources for Teachers of Mathematics, a newsletter published by the Saskatchewan Mathematics Teachers' Society. The theme of the seventh edition is patterning and algebra and in this article Alain shows how experiments can be used to make connections between formulas and real life situations.
Math on the Farm
 
This article discusses some of the many ways in which math is used in agriculture. It considers specific agriculture processes, as well as a variety of math concepts.
On MY Mind (HTML or PDF)
 
In this note we consider a problem involving the ratio of two unknowns and contrast an algebraic solution with a graphic approach.
Pi Day Pie with Two..Foci
 
Gregory gives a challenge problem with an elliptic pie.
Puzzle Brings... Olympic Rings
 
Gregory poses a challenge problem involving the Olympic Rings.
 
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