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 Mathematics: Featured Facts Prime Numbers Mathematics / Number Theory A prime number is a number that is divisible only by one and by itself. Factors are numbers that can be divided into a number with no remainder. The factors of 18 are the numbers 1, 2, 3, 6, 9, and 18 continue reading this fact Eratosthenes Measured Earth’s Circumference—Centuries Before Columbus Sailed Mathematics / Geometry Eratosthenes (c. 276 – 194 BC) was born more than 2200 years ago in the Greek city of Cyrene, now a city in the North African country of Libya. (The Greek Empire surrounded much of the Mediterranean S continue reading this fact How To Calculate The Area Of A Circle Mathematics / Geometry A circle is the round counterpart of a square. To find the area of a square, one multiplies the length by the width. A circle doesn't have these, however, so there has to be a different way to calcula continue reading this fact All Facts Algebra: Geometry: History: Math Function: Number Theory: Topology:
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