*Macmillan Science Library: Mathematics*. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.

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## Radical Sign

The radical sign may be one of the stranger-looking mathematical symbols, but its strange looks should not fool anyone. The radical sign has a straightforward meaning.

The sign that is used when finding the square root or cube root, , is called the radical sign. A radical sign with no index number written in the notch indicates a square root. A square root can also be written with an index of , but usually the 2 is understood rather than expressly written. A radical sign with an index of 3 is written as , which indicates a cube root.

For example, to calculate the area of a square (in which all sides are equal), multiply the length of one side *s* by itself (squaring), so the area is *s*^{2}. If the area of a square is known but not the length of the side, the **inverse** of squaring will find the...

This section contains 1,073 words(approx. 4 pages at 300 words per page) |