The angle of a vector can be determined using the inverse tangent function (arctan) of the vector's y-coordinate over its x-coordinate. This will give you the angle in radians, which can then be converted to degrees if needed.
No, unit notation is just one way of representing a vector. It is often used when dealing with physics or geometry problems, but there are other methods of representing vectors that may be more appropriate in certain situations.
The angle represents the direction of the vector. In unit notation, the angle is measured counterclockwise from the positive x-axis.
The correct angle will result in a vector that has the correct magnitude and direction as specified in the unit notation. If the vector does not match the given information, then the angle is likely incorrect.
Yes, a protractor can be used to measure the angle of a vector on a graph. However, it is important to make sure that the graph is drawn to scale in order to get an accurate measurement.