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At Right Angles March 2021


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Isn’t mathematics simply divine? Not an unexpected line from the At Right Angles team but one that we will back up with our Features article from the March 2021 issue: Geometric Constructions from the Sulvasutras. It’s an incisive dive from there to the Utilitarian Math World but your disillusionment will be healed with delightful articles on understanding some of the whys of procedures and rules in mathematics such as the divisibility rules, the square root algorithm, the formula for the median and the folk method to find the height of a tree.

We bring you a new first with this issue: for the first time, AtRiA goes beyond its covers with three additional articles available only in the online mode. A big shout out to the numerous submissions which enable us to take this leap.

Do revert with your feedback on [email protected]

   
Editorial

Sneha Titus
Editorial


 

Content


Content


 

Features

S.G. DANI & MEDHA LIMAYE
On some Geometric Constructions in the Sulvasutras from a Pedagogical Perspective-I


 

Classroom

KUMAR GANDHARV MISHRA
A Utilitarian Math World: The Tail that Wags the Dog


 
 
ANKIT PATODI
Interpretation of Divisibility Rules

 

AMIT CHAND
How the Square Root Algorithm works


 
 
RANJIT DESAI
Complete Journey of a Minute Hand


 

MATHEMATICS CO-DEVELOPMENT GROUP, Azim Premji Foundation
Deciphering the Median Formula


 
 
SHAILESH SHIRALI
How To Prove It


 

JAMES METZ
Winning Ways


 
 
Mahit Warhadpande
Height of a Tree: Justifying the folk method

 

Swati Sircar
TearOut: Sketches and Views: Mapping 3D to 2D and vice versa


 
 
TechSpace

JONAKI GHOSH
Exploring the Nine-point Circle: Conjecture making and Proof using Dynamic Geometry Software

 

Problem Corner


SASIKUMAR K
A Problem in Elementary Number Theory


 
 
ANAND PRAKASH
A Problem Concerning Prime Numbers

 

A. RAMACHANDRAN
Middle School Problems on Polygons


 
 
SIDDHARTHA SANKAR CHATTOPADHYAY
On the Tens Digit of a Prime Power


 

UTPAL MUKHOPADHYAY
Some Results Concerning Regular Polygons


 
 
PRANEETHA KALBHAVI
Solutions to Two Problems


 

PRITHWIJIT DE
On Some Questions Related to a Triangle


 
 

Student Corner


HARAN MOULI
Summing V: A Correction


 
 
GAURAV CHAURASIA
An Approach to Cubic Equations


 

RAKSHITHA
Two Problems in Number Theory - Part I


 
 

Review


Keerthi Mukunda & Kamala Mukunda
Review of the Film Secrets of the Surface by George Csicsery, 2020


 
 
Swati Sircar
Review: Ganitmala


 

Pullout


PadmaPriya Shirali
Triangles

 

Online Articles

Rakshitha & P N Subrahmanya
A Geometry Problem from the Putnam 2019 Competition


 
 
Michael De Villiers (MdV) & Hans Humenberger (HH)
Ghosts of a Problem Past


 

Shailesh Shirali
Kohli's Number 2997


 


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