# Find the Coordinates of a Point

How to find the coordinates of a point on the coordinate graph paper?

In the adjoining figure, for locating the coordinates of a point draw XOX' and YOY' are co-ordinate axes.

To locate the position of point P, we draw a perpendicular from P on X'OX, i.e., PT ┴ XOX'

So, the co-ordinate of point P are (OT, PT).

Example to find the coordinates of a point:

1. In the adjoining figure, XOX' and YOY' are the co-ordinate axes. Find out the coordinates of point A, B, C and D.

Solution:

To locate the position of point A, draw AQ ┴ X'OX.

Then the co-ordinate of point A are (OQ, QA) i.e., A (5, 2). These points lie in the I quadrant.

To locate the position of point B, draw BP ┴ X'OX.

Then the co-ordinate of point B are (OP, PB) i.e., B (-3, 4). These points lie in the II quadrant.

To locate the position of point C, draw CS ┴ X'OX.

Then the co-ordinate of point C are (OS, SC), i.e., C (-4, -2). These points lie in the III quadrant.

To locate the position of point D, draw DR ┴ X'OX.

Then the co-ordinate of point D are (OR, RD) i.e., D (3, -2). These points lie in the IV quadrant.

2. In the adjoining figure, XOX' and YOY' are the co-ordinate axes. Find out the coordinates of point P, Q, R, S, T and U. Also write the abscissa and ordinate in each case.

Solution:

To locate the position of point Q:

Point Q is the I quadrant where abscissa and ordinate both are positive.

Perpendicular distance of Q from y-axis is 4 units.

So, x-co-ordinate of Q is 4.

Perpendicular distance of Q from x-axis is 3 units.

So, y-co-ordinate of Q is 3.

Therefore, co-ordinate of Q are (4, 3).



To locate the position of point P:

Point P is the II quadrant where abscissa is negative and ordinate is positive.

Perpendicular distance of P from y-axis is 2 units.

So, x-co-ordinate of P is -2

Perpendicular distance of P from x-axis is 5 units.

So, y-co-ordinate of P is 5

Therefore, co-ordinate of P are (-2, 5)

To locate the position of point S:

Point S is the III quadrant where abscissa and ordinate both are negative.

Perpendicular distance of S from y-axis is 4 units.

So, x-co-ordinate of S is -4.

Perpendicular distance of S from x-axis is 1 unit.

So, y-co-ordinate of S is -1.

Therefore, co-ordinate of S are (-4, -1)

To locate the position of point R:

Point R is the IV quadrant where abscissa is positive and ordinate is negative.

Perpendicular distance of R from y-axis is 2 units.

So, x-co-ordinate of R is 2

Perpendicular distance of R from x-axis is 4 units.

So, y-co-ordinate of R is -4

Therefore, co-ordinate of R are (2, -4)

To locate the position of point T:

Point T is in the positive x-axis. We know, that the co-ordinate of a point on x-axis are of the form (x, 0)

Perpendicular distance of T from y-axis is 2 units.

So, x-co-ordinate of T is 2

Perpendicular distance of T from x-axis is 0 unit.

So, y-co-ordinate of T is 0

Therefore, co-ordinate of T are (2, 0)

To locate the position of point U:

Point U is in the negative y-axis. We know, that the co-ordinate of a point on y-axis are of the form (0, y)

Perpendicular distance of U from y-axis is 0 units.

So, x-co-ordinate of U is 0

Perpendicular distance of U from x-axis is 4 units.

So, y-co-ordinate of U is -4

Therefore, co-ordinate of U are (0, -4)

The above worked-out problems will help us to find the coordinates of a point on the graph paper.

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Coordinate Graph

Signs of Coordinates

Find the Coordinates of a Point

Coordinates of a Point in a Plane

Plot Points on Co-ordinate Graph

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Graph of Perimeter vs. Length of the Side of a Square

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Graph of Simple Interest vs. Number of Years

Graph of Distance vs. Time