In the same way as the X-axis, the values start at the origin with zero and increase as we move upwards. So, 4 on the X-axis is 4 positions to the right of the origin. This is the X-axis of the coordinates, and the larger its value, the farther to the right the dot is placed. The first value is zero and the numbers increase as we move to the right. As you can see, the numbers start at the origin. Let’s look at the horizontal line, left-right. It’s called the origin because it’s the point from which the lines that delineate the two axes of the coordinates originate. O, the origin, is where you can see the green planet in the image above. A reference point from which we can measure: the origin.
If we want to indicate something on a plane, we need: So if we say that point P has coordinates (3, 5) we are saying that it is located at point 3 on the horizontal axis and point 5 on the vertical axis. When we want to know what the points of a certain coordinate are (which we usually name with capital letters like P, Q, R or A, B, C) we just keep in mind that they are placed like this: These two axes cross at a point called the coordinate origin, O.Īnother name given to the axes of coordinates are abscissa for the X-axis (horizontal) and ordinate for the Y-axis (vertical). The horizontal axis is usually named X and the vertical axis is Y. The “last name” of the cartesian coordinates is a tribute to the philosopher and mathematician René Descartes.Ī Cartesian coordinate system is formed by two straight perpendicular lines, which we call coordinate axes. We work on Cartesian coordinates in a two-dimensional space, on a plane, but we can also use them in spaces of three or more dimensions. When we play Battleship we are using Cartesian coordinates.Ĭartesian coordinates is the name given to the system used to locate a point in space. When we play Battleship we say a letter for the vertical position and a number for the horizontal position when we try to locate our rival’s boat. Known Final Coordinates with Visual Help in the First Quadrant.Known Final Coordinates with Several Movements in the First Quadrant.Known Initial Coordinates and Simple Movement with Visual Help in the First Quadrant.Examples of Coordinate Exercises in Smartick.
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