Teacher development

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Adventures in Problem Solving - March 2019Article | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

In this edition of ‘Adventures’ we study a few miscellaneous problems, some from the PRMO and some from the AIME (the ‘American Invitational Mathematics Examination’).

Pythagorean Triples and CompositionArticle | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

We know that Pythagorean triples are infinite in number, and the most common formula for generating triples is to take two relatively prime odd numbers s and t, where

The Truncated Icosahedron – An Iconic 3-D ShapeArticle | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

There is another class of semi-regular 3D shapes - the Archimedian solids. In these the faces are again regular polygons but they are not all congruent, i.e.

Finding the Square Root of a Four-Digit Perfect SquareArticle | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

On the web page [1] belonging to A2Y Academy For Excellence, there appears a curious method to find the square root of a four-digit number if it is known that that num

Primitive Pythagorean TripleArticle | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

A classroom observation. A colleague a shared an observation that had come up during an exploratory class he was taking at the middle school level.

On Adding Magic TrianglesArticle | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

Magic triangles can be added to each other term by term, the same way that magic squares can be added to each other.

Addendum to Theorem concerning A Magic TriangleArticle | By At Right Angles | Mar 27, 2019  | Mathematics | 0 Likes

In the July 2018 issue of At Right Angles, the topic of magic triangles was explored, a ‘magic triangle’ being “an arrangements of the integers from 1 to n on the side

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