1.

At inception, I was defined as one

ten-millionth of the distance between the equator and

the north pole.

The Meter

2.

I estimated the circumference of the earth more than 2000 years ago, and was called Archimedes' beta.

Erathostenes

3.

I am 1729, a taxi cab

number made famous

by the Indian mathematician

Srinivasa Ramanujan.

I am the smallest number that can be written as the sum of two cubes in two different ways.

4.

I am MathCollections' favicon, and an example of this

geometric object. 

A Steiner's Chain

Photo: Frans Lanting/Corbis

Fairy Circles in Namibia

6.

I am the distance

light travels in

​

of a second.

​

The Meter

Museum of Art, Philadelphia

Circles in a Circle by W. Kandinsky

Source: HebrewBooks.org

Circles in a Circle by W. Kandinsky

I was a rabbi born around 1070 in Barcelona, Spain, and created the visual proof for the area of a circle shown below.

Abraham bar Ḥiyya ha-Nasi