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1. Algebra comes from the arabic "al-jabr" meaning "reunion of broken parts.
2. Triangles are polygons with the least possible number of sides (three).
3. 1 kilogram is equal to 1000 grams.
4. "May I have a large container of coffee?" is used to remember the value of pi.
The value of zero was first used by the ancient Indian mathematician Aryabhata.