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

ganesh
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Registered: 2005-06-28
Posts: 19,195

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
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Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

kk-neatwork.gif


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
Moderator
Registered: 2005-06-28
Posts: 19,195

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
Moderator
Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

try.jpg


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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#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
Moderator
Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

Correct, mathsyperson! smile smile smile


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
Moderator
Registered: 2005-06-28
Posts: 19,195

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.

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#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
Moderator
Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

You're correct, Patrick! Well done! up


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
Moderator
Registered: 2005-06-28
Posts: 19,195

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
Moderator
Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

f40w_well_done.jpg

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.

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

ganesh
Moderator
Registered: 2005-06-28
Posts: 19,195

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.

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#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
Moderator
Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

Excellent, Dionysus! up cool roflol


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
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Registered: 2005-06-28
Posts: 19,195

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.

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

ganesh
Moderator
Registered: 2005-06-28
Posts: 19,195

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

Re: Coordinate Geometry

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

ganesh
Moderator
Registered: 2005-06-28
Posts: 19,195

Re: Coordinate Geometry

kk-neatwork.gif


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

ganesh
Moderator
Registered: 2005-06-28
Posts: 19,195

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.

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#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
Moderator
Registered: 2005-06-28
Posts: 19,195

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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