# Hat Unit Vector

**This may sound like a new concept but its a simple one directly related to the unit circle the Pythagorean Theorem and the definitions of sine and cosine.**

**Hat unit vector**.
Here vector a is shown to be 25 times a unit vector.
By convention a unit vector is indicated by a hat over a vector symbol.
Unit vector along ijisij ij ij is magnitude of ijwe knowi and j are perpendicular to each otherSo ij i2 j 2 2ij cos90o 11 2 hence unit vector along ijis 2ij.

Every unit vector needs a circumflex often called a hat or an explanation. The unit vector along hatihatj is. The symbol is usually a lowercase letter with a hat such as.

I am assuming hat theta defined in this way. Right now the best thing going for me is to define. The unit vector for the x axes.

The hat was also used for the standard unit vectors in the direction of the x- y- and z-coordinate axes. The unit vector is the vector having a special direction with unit magnitude. It can be calculated using a Unit vector formula or by using a calculator.

Notice they still point in the. Comma three or you could represent it as two times I with this little hat over it plus three times J with this little hat over it I is the unit vector in the horizontal direction and the positive horizontal direction if you want to go the. Let eqdisplaystylevec u x hat x y hat y z hat z eq be a vector.

A vector has magnitude how long it is and direction. Mathveca vecia_x vecja_y vecka_zmath when you do a dot. It is represented using.