# Transformation

## QUILTING Explorations by a Mathematics Teacher

I must confess that it was the top layer that attracted me to quilting. This was clearly a case of the whole being greater than the sum of its parts- I was wonderstruck at how scraps of material could be pieced together to make beautiful patterns that were all at once eye-catching and pleasing.

## Transformation in Education, a TEDx Talk by Nandita Das

Alongside a successful and award winning career as an actress and director, Nandita achieved a Masters degree in Social Work from University of Delhi and has continuously worked with various NGOs. As a chairperson of the Children's Film Society, Nandita is passionate about producing and delivering high quality films for children. Nandita Das was a Yale World Fellow 2014. She was among the 16 emerging global leaders who were chosen from close to 4000 applicants.

## Hill Cipher II

This article is a sequel to an article which appeared in the November 2014 issue of At Right Angles in which we had
described an interesting cryptography method known as the Hill Cipher. The Hill Cipher method is based on matrices and
modular arithmetic. As in the previous article, we will explore the method using the spreadsheet MS Excel in which we will
perform operations on matrices.

## Make Tiling Patterns

tessellation of a flat surface is the tiling of a

## Pentominoes

Pentomino puzzles are a valuable educational resource in their avatar as puzzles, they can also be used effectively to build spatial intuition.

## Of Art & Math: Introducing Symmetry

In our November column we introduced the concept of ambigrams—the art of writing words in surprisingly symmetrical ways. In this column, we use ambigrams to demonstrate (and play with) mathematical ideas relating to symmetry and invariance.

## Introducing Ambigrams

In this article, by Punya Mishra and Gaurav Bhatnagar, we are going to focus on a very specific kind of artistic wordplay (and its relationship to mathematics) - Ambigrams.

## Changes around Us

Why and how do things change? Do they all follow the same pattern? Or do different things change differently? What are the different kinds of changes? These are the questions that this lesson seeks to answer.

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