At Right Angles

July 2016

Many of you would have found the July 2016 issue of At Right Angles on your tables on the morning of July 19.  Our cover this time focuses on women who have broken the class ceiling -  we have an account of Jill Adler, a South African mathematics researcher and her work in the field of math pedagogy, written by Ravi Subramaniam of HBCSE who knows her work well. And we also have a review of Jo Boaler’s Mathematical Mindsets. Jo Boaler is a British education author, and is Pro...read more

At Right Angles

March 2016

Symmetry, infinity & triangles are the chief ingredients that will keep you engaged in 2016's first issue of At Right Angles. By the way, the year 2016 itself is a triangular number. We are continuing with the Desmos-based activity & of course the recurring theme at AtRiA, nay mathematics itself 'How to Prove It'. Also find in the pages, the review of professor Ian Stewart's book 'Taming the Infinite'. And as a finishing touch, this issue's Pullout section addresses Word Problems, a h...read more

At Right Angles

November 2015

Two themes dominate this issue of AtRiA: Archimedes & Magic Squares - an unlikely combination! Both are exceedingly rich topics to write about, with histories that go far back in time. Who can't be both charmed and thrilled by the story of Archimedes?

At Right Angles

July 2015

A popular mathematics magazine seems to be a paradoxical phrase, but here is our tenth issue and with a growing subscriber list, we seem to be both popular and mathematical! This issue is all about paradoxes. We also have Morley’s Miracle Part III and some stunning insights into the appearances of the 3‐4‐5 triangle, an article on Tests for Divisibility by Powers of 2, an article on Prime Generation. Check out the continuation of Low Floor, High Ceiling activity series, and the ever enchantin...read more

At Right Angles

March 2015

The lead feature in the March 2015 issue of AtRiA is based on the theme Proof Without Words. In the Review section, Mark Kleiner discusses Edward Frenkel's Love and Math - the Heart of Hidden Reality. Thomas Lingefjard, in his article Learning Math with a DGE system, addresses a pressing need of teachers using technology in the classroom. This issue features a new author Ali Hussen whose article weaves in algebra, geometry and arithmetic. It also introduces a new series on Low Floor High Ceil...read more

At Right Angles

November 2014

AtRiA's November issue celebrates the 900th anniversary of Indian mathematician Bhaskaracharya II and takes you on a walk down the history of mathematics. You'll also find articles on portfolio assessment, ciphers, and quadrilaterals, among others. The pullout in this issue is focussed on Geometry.

At Right Angles

July 2014

From tessellations and a theorem in plane geometry to Desmos, an online math application, puzzles and Pentominoes, this issue of AtRiA brings to you a range of mathematical topics. Division is the topic focussed on in the pullout.

At Right Angles

March 2014

Visual riches dominate this issue. Haneet Gandhi talks about Tessellations and the principles they derive from, and also the cultural and historical background in which they are anchored, for example, Islamic art and architecture. Punya Misra and Gaurav Bhatnagar continue their series on the pattern-filled world of Ambigrams and symmetry. The Classroom section has plenty on offer too with a puzzle and articles on assessment, approximations and decimals. In the Tech Space section, Jonaki Ghosh...read more

At Right Angles

November 2013

This issue has plenty of material on prime numbers, and the cover depicts, amidst a generous sprinkling of primes, the famous Greek mathematician Eratosthenes who made important contributions to Mathematics and Geography. Art and Mathematics section features some incredible ambigrams by Punya Misra and Gaurav Bhatnagar and the math behind them. A Teacher’s Diary on Classroom Assessment which is a joint effort of the A&P and IAA teams and is an attempt to translate the vision of CCE into p...read more

At Right Angles

July 2013

We featured in this issue one of the great characters of twentieth century mathematics: Paul Erdős. This was appropriate as 2013 is the centenary year of his birth. Next, there was an article on the derivation of Brahmagupta’s formula for area of a cyclic quadrilateral via the use of Heron’s formula. In ‘Classroom’ we had an essay on Angles which explores some pitfalls that can waylay the learner. In Math Club we had a piece on the combinatorics of Braille.

At Right Angles

March 2013

In this issue we showed how to make an origami skeletal dodecahedron using paper but without the use of scissors or adhesives. We also showed how a well-known identity for the sum of the cubes of the natural numbers generalizes in a non-obvious way. Next we had an article on PIE – the Principle of Inclusion and Exclusion. Following that we had an article on Harmonic Triples. Next, we had a review of one of Polya’s most famous books. We started a new series on Problem Solving in Geometry. In ‘...read more

At Right Angles

December 2012

In this issue, which appropriately featured Srinivasa Ramanujan on the cover, we started with Lagrange’s Four Squares Theorem followed by articles on games of chance; on the axiomatic basis of origami, and an unexpected construction possible under the rules of paper folding; on a beautiful theorem of Euclidean geometry called Viviani’s theorem; and on using a spreadsheet to explore the famous conundrum known as the ‘Monty Hall problem’. We also covered one of the premier events in mathematics...read more