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Grade 3 - Mathematics
8.18 Points on a Grid
Coordinate plane has two axes. They intersect at right angle and form four quadrants.
The two number lines form the axes.
The horizontal number line is called the x-axis.
The vertical number line is called the y-axis.
The center of the coordinate plane is called the origin. It has the coordinates of (0,0).
Locations of points on the plane can be plotted when one coordinate from each of the axes are used. This set of x and y values are called ordered pairs.
The points in a grid are named by ordered pairs.
The first number gives the position to the right of 0.
The second number gives the position above 0.
The axes along which the ordered pairs are marked are called co-ordinate axes.
: What is the ordered pair of point A?
Answer the following questions. Also take a graph paper and plot at least 15 points and label the ordered pair.
: In the figure what is the point with ordered pair (4,5).
: ____ are ordered pairs of numbers written within parentheses and used to locate points on coordinate axes.
ordered number pairs
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