Introduction to coordinate_geometry_pdf

 To introduce the idea, consider the grid . The
columns of the grid are lettered A,B,C etc.
The rows are numbered 1,2,3 etc from the
top. We can see that the X is in box D3; that
is, column D, row 3.

 .


 D and 3 are called the coordinates of the box.
It has two parts: the row and the column.
There are many boxes in each row and many
boxes in each column. But by having both we
can find one single box, where the row and
column intersect


 The Coordinate Plane
 Incoordinate geometry, points are
placed on the "coordinate plane" as
shown below. It has two scales - one
running across the plane called the "x
axis" and another a right angles to it
called the y axis. (These can be
thought of as similar to the column
and row in the paragraph above.) The
point where the axes cross is called
the origin and is where both x and y
are zero. ©Bharatiya Vidya Bhavan,Middle

 On the x-axis, values to the right are positive

 and those to the left are negative.
 On the y-axis, values above the origin are
positive and those below are negative

Apoint's location on the plane is
given by two numbers, the first tells
where it is on the x-axis and the
second which tells where it is on the
y-axis. Together, they define a
single, unique position on the plane.
So in the diagram above, the point A
has an x value of 20 and a y value of
15. These are the coordinates of the
point A, sometimes referred to as its
"rectangular coordinates". Note that
the order is important; the x
coordinate is always the first one of
the pair. ©Bharatiya Vidya Bhavan,Middle

Introduction to coordinate_geometry_pdf

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