The Last Archimedean

Geometry Level 1

Ludolph van Ceulen used Archimedean polygons to calculate the value of pi out to 35 decimal places.

True or false: Using this approximation for pi and an exact equatorial diameter for Earth, the calculation of the length of Earth's equatorial circumference would be off by less than the diameter of a proton.

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The Last Archimedean

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Featured

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Community

100 Day Summer Challenge

The Last Archimedean

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.