One rotation.
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It is a quarter of the plane: a quarter of a turn from one axis to the next.
The x axis is horizontal and the y axis is vertical.
If a point is on both the x-axis and the y-axis, then it must be in the only point where the x-axis and y-axis intersect. The point where they intersect is (0,0) which is called the origin.
An arrowhead is also called a delta. It is a concave quadrilateral with one axis of symmetry.
because it takes 24 hours for the earth to do a complete rotation around its axis