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## #1 2006-02-27 16:44:14

ganesh
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Registered: 2005-06-28
Posts: 27,843

### Coordinate Geometry

CG # 1

Find the area of the triangle whose vertices are
(2, -3), (-1, 3) and (4, 7).

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #2 2006-02-27 18:32:13

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

### Re: Coordinate Geometry

21

IPBLE:  Increasing Performance By Lowering Expectations.

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## #3 2006-02-27 19:45:29

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #4 2006-02-27 20:17:05

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

### Re: Coordinate Geometry

That was easy. I solved it in Paint for~1min

IPBLE:  Increasing Performance By Lowering Expectations.

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## #5 2006-02-28 16:17:19

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 2

Find (x,y) if (3,2), (6,3), (x,y) and (6,5) are the vertices of a parellologram taken in order.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #6 2006-02-28 17:59:51

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

### Re: Coordinate Geometry

{3,4}?

IPBLE:  Increasing Performance By Lowering Expectations.

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## #7 2006-02-28 19:41:06

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #8 2006-03-01 03:37:59

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

### Re: Coordinate Geometry

(9,6)?

Why did the vector cross the road?
It wanted to be normal.

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## #9 2006-03-01 03:46:38

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

Correct, mathsyperson!

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #10 2006-03-01 04:00:29

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 3

If 3x-2y+4=0 and ax+4y+3=0 are parallel lines, find the value of a.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #11 2006-03-01 06:17:02

Patrick
Real Member
Registered: 2006-02-24
Posts: 1,005

### Re: Coordinate Geometry

CG# 3
a = -6?

Last edited by Patrick (2006-03-01 06:17:20)

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## #12 2006-03-01 15:59:53

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

You're correct, Patrick! Well done!

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #13 2006-03-01 16:13:04

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 4

Find the equations of the lines which pass through the point (3,4) and make intercepts on the axes such that their sum is 14.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #14 2006-03-01 18:08:18

ryos
Member
Registered: 2005-08-04
Posts: 394

### Re: Coordinate Geometry

El que pega primero pega dos veces.

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## #15 2006-03-01 18:25:24

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

They are the only equations for which the conditions work

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #16 2006-03-02 17:39:04

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 5

Find the equation of the perpendicular bisector of the line joining the points A(-1,2) and B(3,-4).

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #17 2006-03-06 16:22:15

Dionysus
Member
Registered: 2006-03-06
Posts: 9

### Re: Coordinate Geometry

Last edited by Dionysus (2006-03-06 16:22:49)

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## #18 2006-03-06 16:50:37

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

Excellent, Dionysus!

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #19 2006-03-06 18:31:40

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 6

Prove that the lines 3x-4y+5=0, 7x-8y+5=0 and 4x+5y=45 are concurrent.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #20 2006-03-08 20:02:03

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 7

Show that the points (4, -4), (-4, 4), and (4√3, 4√3) are the vertices of an equilateral triangle.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #21 2006-03-09 16:50:39

Dionysus
Member
Registered: 2006-03-06
Posts: 9

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## #22 2006-03-10 03:00:46

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #23 2006-03-10 04:27:36

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

CG # 8

Find the equation of the straight line making an angle 135° with the positive direction of x-axis and cutting an intercept 5 on the y-axis.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Online

## #24 2006-03-10 04:31:37

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

### Re: Coordinate Geometry

tan 135° = -1, so that is the gradient of the line. We are told that the y-intercept is 5, so the equation is y = 5-x.

Why did the vector cross the road?
It wanted to be normal.

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## #25 2006-03-10 15:50:29

ganesh
Administrator
Registered: 2005-06-28
Posts: 27,843

### Re: Coordinate Geometry

Very good, mathsyperson!

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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