### At Right Angles

July 2019The beautiful image that you see on the cover is a fractal, a recent entrant into the world of mathematics, dating from the 1980s in the work of the mathematician Benoit Mandelbrot, who himself coined the term ‘fractal’. Mandelbrot recognised that most objects found in nature cannot be modelled very well by the regular objects we encounter in Euclidean geometry (triangles, rectangles, circles, spheres…). Here are some famous quotes of his about fractals:

“A fractal is a mathematical se...read more

### At Right Angles

November 2018Lazy summer afternoons spent playing endless games of Sutli or hopscotch or any of those absorbing games have often become the topic of endless reminiscing about the good old days. Well, let’s bring them back! With a math slant at that. Can the shapes made with knotted string lead to a better understanding of Euclidean geometry and 3 D space? Can the mobiles which hang over a baby’s crib be used to understand how to solve equations? Can a teacher see how easy it is to reinvent a toy or a game...read more

### At Right Angles

July 2018Sense-making in mathematics is all too necessary if we need to keep our wits about us in today’s world, particularly with the onslaught of

information that we face every day. NCF 2005 speaks about the importance of developing reasoning skills in children and this is the

foundation of mathematical competency. A school course that does not develop this skill in children is surely shortchanging them.

### At Right Angles

November 2017The word ‘heuristics’ has always left me fumbling for the perfect definition. Rule of thumb seems adequate but too informal, as a teacher trainer, I’ve always preferred to illustrate rather than define this word. And the first article in the November issue does just that- Gaurav Bhatnagar, leads you gently into the **Exponential Series- a heuristic definition!** The relaxed tone continues with V. G. Tikekar setting the stage to arrive at formulae which are usually given and prove...read more

### At Right Angles

August 2017The (un)popular view of mathematics being a terrifying subject takes a completely new twist with the first article in which a mathematician takes on a terrorist threat! The hunt for answers to a mathematical problem is usually an absorbing one, at least to aficionados of the subject but Arun Vaidya's fascinating story I M Code makes it a matter of life and death.

Following this, we have an article on another application of mathematics: Interpolation by Sankaran Viswanath. You will see a...read more

### At Right Angles

March 2017Going to the heart of the art is key to mathematics.Yes, a picture can be a powerful pedagogical tool. This issue of At Right Angles celebrates the art of the matter. The cover image by Avita Chauhan of the Azim Premji Foundation sparked some thought on how mathematics is so much about going to the *heart* of the matter. Read how we generated her image using GeoGebra and then transformed it to a completely new work of art. Art and Math find a new meeting place at the Foundation!, Anot...read more

### At Right Angles

November 2016Children Doing Math is the theme of the November issue of At Right Angles and we would encourage you to read it from cover to cover! We have reason to celebrate- with three articles written by children based on investigations done by them. We look forward to featuring more such articles by our young readers and we are truly satisfied that we have stayed true to our vision and provided them with a platform on which they can write about their findings.This issue of At the Right Angles celebrat...read more

### At Right Angles

July 2016Many 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 2016Symmetry, 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 2015Two 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 2015A 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 2015The 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

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