Polygon Angle Explorer

Exterior Angles of Regular Polygons

insect

Interior Angles of Regular Polygons

Interior Angles of Irregular Polygons

The sum of the interior angles of an n-sided polygon is 180 × n - 360 degrees.

⏯ Regular Exterior ⏯ Regular Interior ⏯ Irregular Interior ⏯ Polygon Profiles

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Sieve of Eratosthenes

Sieve of Eratosthenes

A self checking, interactive version of the Sieve of Eratosthenes method of finding prime numbers. So far this activity has been accessed 36760 times and 4112 Transum Trophies have been awarded for completing it.

The animations above were made for the this video:

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