This applets allows students and teachers to investigate the components of a vector.
Two sliders input the magnitude of the vector, and its direction measured in degrees counter-clockwise from the positive x-axis.
A check box toggles the visibility of the rectangle whose diagonal is the vector in question.
Two toggle buttons are provided:
One toggles the angle shown

Between vector and positive x-axis

Between vector and positive y-axis

Between vector and x-component vector

Between vector and y-component vector

No angle

The other button toggles through different pairs of component-vectors.
At the lower left, the scalar-components of the vector are shown along with their calculation.