# At Right Angles

## AtRiA Paper Play - Making a Skeletal Dodecahedron

Building 3D models to enhance learning. What better way for students to understand concepts like vertices and edges than to construct their own 3D models? Constructing a dodecahedron as demonstrated by Shiv Gaur would personalise their learning in a meaningful way and nothing can beat that experience.

## AtRiA Triangles with Sides in a Progression

A short writeup by A. Ramachandran which can spur the motivated teacher to design investigative tasks that connect geometry and sequences.

## AtRiA One Problem, Six Solutions

A simple problem with many solutions!

## AtRiA Slicing a Cube - Sum of Cubes and Square of a Sum

Understanding the algebraic identities...

## AtRiA An Impossible Construction

It is well known that there is no general procedure for trisecting an angle using only a compass and unmarked ruler (naturally, we must stick to the rules governing geometric constructions).

## AtRiA Cousin to Viviani’s Theorem

A letter from the editors about  Viviani’s theorem and  its corollary - the ‘cousin’ to Viviani’s theorem - that was shared in Issue I-2 of At Right Angles.

## AtRiA Problems for the Middle School - March 2013

The problems in this selection are all woven around the theme of GCD (greatest common divisor, also known as, highest common factor) and LCM (least common multiple). The solutions to problems posed will appear in the next issue of AtRiA's problem corner

## AtRiA Fun Problems

Digital Problems for the Digital Age

The solutions to problems posed will appear in the next issue of AtRiA's problem corner.

## AtRiA Notes from a small school

Shashidhar Jagadeeshan shares the experience at the Centre For Learning in creating an environment where children can enjoy learning mathematics.

## AtRiA The Mathematical "i"

A poem on the imaginary number i by Punya Mishra

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