### At Right Angles

July 2014From 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 2014Visual 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 2013This 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 2013We 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 2013In 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 2012In 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

### At Right Angles

June 2012With this issue we started the publication of a national level magazine, addressed directly to teachers and students at the middle and high school level. The inaugural issue had a lot of material on the Pythagorean theorem and on themes related to this theorem. There was a ‘proof without words’ from the late Prof A R Rao; articles on paper folding, on the use of spreadsheets, on a way of classifying quadrilaterals, on the use of math portfolios in teaching, and on teaching fractions at the pr...read more

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