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# Group items tagged

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### Illuminations: Computing Pi- 3 views

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The National Council of Teachers of Mathematics is a public voice of mathematics education, providing vision, leadership, and professional development to support teachers in ensuring mathematics learning of the highest quality for all students. With 100,000 members and 250 affiliates, NCTM is the world's largest organization dedicated to improving math education in preK‑12.

The Greek mathematician Archimedes approximated pi by inscribing and circumscribing polygons about a circle and calculating their perimeters. Similarly, the value of pi can be approximated by calculating the areas of inscribed and circumscribed polygons. This activity allows for the investigation and comparison of both methods.

Instructions:
In this applet, polygons are inscribed and circumscribed around circles. The area of the polygons around a circle of radius 1 are calculated on the left, and the perimeter of the polygons around a circle of diameter 1 are calculated on the right.
Change the value of n to increase or decrease the number of sides in the polygons, and notice how the calculations of the areas and perimeters begin to approximate pi.

### Sound (Dillfrog Muse)- 1 views

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Good tool! Search words for similar sound, meaning or related

### Learning English free with Songs, listening, online, music, videos, subtitled, lyrics, ...- 5 views

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Learn English through songs, videos, … with subtitles and / or lyrics.
Apprenez l'anglais grâce à des chansons, des vidéos, … avec des sous-titres et / ou des paroles.

### ABBYY Lingvo Online Dictionary &amp; Translator - Latin, Russian, Ukrainian...- 2 views

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Lookup + Translate latin - + many estern languages (with virtual keyboard)

### Smart.fm - The World's Sharpest Learning Tool.- 5 views

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takes the burden out of learning by automatically creating a learning schedule that adapts to the individual's performance and needs. The system combines proven learning science with the latest in adaptive, semantic and social Web technologies. Powered by personalized learning algorithms, Smart.fm measures memory strength on a granular item by item basis. The algorithms are based on decades of research on optimum learning patterns in the fields of cognitive science and neuroscience.

• ## Introduction

Word length and phrase length influence the ease of reading and understanding of a given text. Short words are usually more common (Zipf's law). Short sentences require less abstraction ability to understand. The readability analysis could be useful to make a text better, augmenting its accessibility.

## Why have we developed this?

The readability index tells us how easy a given text is to understand. A well-written text is effective, easy to understand and quick to read. This index helps us understand the text's complexity in order to better schedule the activities of translators and revisers. More than ever, written information, especially in the Internet, must be direct and well structured. This analysis can help achieve both goals.

### Portail des langues bab.la- 3 views

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Le portail des langues bab.la propose des dictionnaires, des outils de traduction, des tests et des jeux linguistiques, des leçons de vocabulaire pour l'apprentissage des langues et encore bien d'autres fonctionnalités. bab.la est un portail interactif: Vous pouvez ajouter vos propres traductions, créer vos tests de langues ou vos exercices de vocabulaire. babla

### whonu.com - be amazed at what you discover!- 0 views

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