A vector has a direction and a magnitude. [br]Usually you draw them as arrows and write them as a small letter with an arrow on top ([math]\text{\vec{a}}[/math]).[br]To tell somebody how far and in which direction the vector points you write the x-component and the y-component in brackets.[br][math]\text{\vec{a}}[/math]=[math]\binom{x}{y}[/math][br]Excersice: Move the slider and look at the vector and the graphics. [br] If you think you know the answer to the vector, you can check it anytime.