# Approximation

## An Approximation of pi by the Law of Cosines

The approximation of π is a popular pastime of students of mathematics and I have started with the familiar age-old way, of fitting a regular polygon tightly in a circle of radius r. The vertices of the n-sided polygon are joined to the centre of the circle so that the angle subtended at the centre by each segment is 360/n. If n is sufficiently large, the perimeter of the polygon approaches the circumference 2πr of the circle and this approximation improves as the number of segments increases.

## Celebrating Pi Day

Here are some activities we compiled it for you that introduce & explore the beauty & universality of pi. Try this today, and celebrate World Pi Day.

1. Take any circlular of your choice. Draw 4 of them next to each other as shown.

## Math Worksheet on Measurement

Here is a worksheet on Measurement of weight for children in the primary school. This fun yet challenging worksheet can be used as a revision or an assessment worksheet. The complexity of the problems increases with every page

MATH WORKSHEET

Circle on the best unit to measure the weight of the following:

## Pullout: Teaching Measurement

Children need to understand that some contexts require precision to a fine degree while some require approximate figures. A strong foundation in measurement concepts leads to a better understanding of decimal numbers in particular.

## How to discover 22/7..

..and other rational approximations to π

In this article, the writer will explain a method to find rational approximations for and other irrational numbers. The key idea here is to use a calculator to find what is called a continued fraction for an irrational number.

## How do you Divide a Strip into Equal Fifths?

How can a simple series of folds on a strip of paper be a mathematical exercise? The article, by Shiv Gaur,  describes not only the how but also the why…..based on Fujimoto’s Approximation Method.

## Estimation skills

The ability to estimate is a practical skill used frequently in our lives. Whether it is gauging sizes or planning budgets, organizing activities and events, or marketing a product. Guessing games go a long way in developing this skill in children.

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