2の平方根
1. Square root of 2The square root of 2, often known as root 2 or radical 2 and written as √2, is the positive algebraic number that, when multiplied by itself, gives the number 2. It is more precisely called the principal square root of 2, to distinguish it from the negative number with the same property. Geometrically the square root of 2 is the length of a diagonal across a square with sides of one unit of length; this follows from the Pythagorean theorem.
Read “Square root of 2” on English Wikipedia
Read “2の平方根” on Japanese Wikipedia
Read “Square root of 2” on DBpedia
Read “Square root of 2” on English Wikipedia
Read “2の平方根” on Japanese Wikipedia
Read “Square root of 2” on DBpedia
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