# Area

## Angles of a Pentagon

Let your students arrive at the sum of a pentagon's internal angles themselves, by folding paper into a pentagon.

Watch this simple video to see how it's done.

Here are some related resources on Teachers of India:

## Equalizers of a Triangle

In mathematics, breaking up is not hard to do!

## Teacher's Diary on Classroom Assessment - III

In my search for suitable projects which encompassed a wide spectrum of arithmetic, geometric and algebraic components with a focus on mensuration, I naturally turned to tangrams. This topic is a favourite for both teachers and project designers...writes Sneha Titus.

## Teacher’s Diary on Classroom Assessment – II

"Assessment needs to provide answers for two questions: How is the student evolving as a learner?  What can I do to facilitate that learning? With the encouragement of a supportive principal, I re-worked the model for formative assessment..."

For part 1 of the article, click here.

## A Fair Division

Mr. Jagirdar finally puts to use what he had memorized: the conditions for the nature of the roots of a quadratic!

## Atmospheric Pressure part 2

Here is another clip on atmospheric pressure. Also watch the part 1 by clicking here

## Atmospheric Pressure part 1

Here is the first clip on atmospheric pressure.

## Problems for the Senior School - December 2012

Here are some problems for students in Senior School. The solutions to problems posed appear in the next issue of AtRiA's problem corner.

## One Formula - Two Derivations

Heron’s Formula for Area of a Triangle...Cleverly used algebra in an old familiar formula for the area of a triangle in terms of its base and height enables the formula to be restated in terms of the sides of the triangle.
Find an account of the derivation by COMAC and a number crossword by by D.D. Karopady.

## AtRiA Problems Corner Section December 2012

This sections is about problems & problem solving, the life blood of mathematics. It has Fun Problems, Problems for the Middle School, and Problems for the Senior School. For each part, the solutions to problems posed will appear in the next issue.

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