When carrying out creation of various geometrical figures sometimes it is required to define their characteristics: length, width, height and so on. If it is about a circle or a circle, then often it is necessary to determine their diameter. Diameter represents a straight line piece which connects two the most remote from each other the points located on a circle.

On the keyboard of the computer there is no sign of a square root. Need of input of this sign can arise at a set of the texts containing mathematical formulas. Also input of the operator for extraction of a square root can be required by drawing up programs in some programming languages.

In operations with the mathematical expressions containing square roots it is desirable to get rid of signs of the radical. There are two main methods to make it: calculation of value of a radicand or its simplification. The first option is applicable when under the sign of a root there are no unknown variables, and the second has no restrictions in use.

The concept of a root from the fourth degree can be considered on the example of the look equation: x*x*x*x=y. A fourth root from number y is x. From this equation it is visible that the number from which the root is taken cannot be negative. The root from zero gives zero. To find x it is possible in several ways.