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QUESTION: 1

**Q. **

We divided the plane of the paper into four equal parts. by drawing two mutually perpendicular lines, X'OX and YOY'. These lines are called the axes. Here X'OX is called x-axis and YOY' is called y-axis. There axes divide the plane of the paper into four parts, called quadrants.

The position of a point in a plane is denoted by an ordered pair (a,b), where a is called the x co-ordinate and y is called y co-ordinate.

In which quadrant does the point(-4, -7) lie?

Solution:

The point (-4, -7) lies in 3rd quadrant.

QUESTION: 2

In which quadrant does the point(1, 5) lie?

Solution:

The point (1, 5) lies in 1st quadrant.

QUESTION: 3

In which quadrant does the point(9, -2) lie?

Solution:

The point (9, -2) lies in 4th quadrant.

QUESTION: 4

In which quadrant does the point(-7, 6) lie?

Solution:

The point (-7, 6) lies in 2nd quadrant.

QUESTION: 5

In which quadrant does the point(0, 9) lie?

Solution:

The point (0, 9) lies in y-axis.

QUESTION: 6

In which quadrant does the point(9, 0) lie?

Solution:

The point (9, 0) lies in x-axis.

QUESTION: 7

Find the coordinates of the point equidistant from the points A(1, 2), B (3, –4) and C(5, –6).

Solution:

**Given** three points A(1,2) B(3,-4) and C(5,-6).

To find the perpendicular bisectors of AB:

The slope of AB = -4-2 / 3-1 = -3

The slope of line perpendicular to AB = 1 / 3

The mid-point of AB is = (1 + 3 / 2, 2 - 4 / 2) = (2, -1)

The equation of perpendicular line is y = 1 / 3(x - 2) - 1

To find the perpendicular bisectors of AC:

The slope of AC = -6 - 2 / 5 - 1 = -2

The slope of line perpendicular to AC = 1 /2

The mid-point of AC is = (1 + 5 / 2, 2-6 / 2) = (3, -2)

The equation of perpendicular line is

y = 1 / 2(x - 3) - 2

Now, solve the above two equations

1 / 3(x - 2) - 1 = 1 / 2(x - 3) - 2

2(x - 2) - 6 = 3(x - 3) - 12

x = 11

y = 1 / 2(x - 3) - 2 = 1 / 2(11 - 3) - 2 = 4 - 2 = 2

The coordinates of the points equidistant from the point A(1, 2) B(3, -4) and C(5, -6) are (11, 2)

QUESTION: 8

Find the distance of the point A(3, -3) from the origin.

Solution:

OA = √3^{2}+(-3)^{2} = √9+9 = √18 = 3√2

QUESTION: 9

P is a point on x-axis at a distance of 4 units from y-axis to its right. The co-ordinates of P are:

Solution:

The co-ordinates of P are A(4, 0)

QUESTION: 10

A is a point on y-axis at a distance of 5 units from x-axis lying below x-axis. The co-ordinates of A are:

Solution:

The co-ordinates of A are A(0, -5)

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