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## #1 2007-03-21 13:14:45

alison
Guest

### helppers absolutely needed..

what is dilation and if given a triangle with the coordinates how can i find the new set of coordinates after dilation has taken place???

## #2 2007-03-21 13:47:14

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

### Re: helppers absolutely needed..

Hmmm , If you know the coordinates of three vertex,  each side of the  new triangle paralells with the old one , that means the slopes are the same, they share the same core.

Numbers are the essence of the Universe

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## #3 2007-03-21 13:52:25

alison
Guest

### Re: helppers absolutely needed..

yeah...but how do i know where the new vertexes will be located? for instance... i have triangle abc with  A(-1,2), B(0,5) and C(5,4). Where will the new vertices be after a dilation of 2???? I need to list the new coordinates and i am sooooo confused.

## #4 2007-03-21 14:16:59

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

### Re: helppers absolutely needed..

maybe the new vertex are on the bisector of each angle.

Numbers are the essence of the Universe

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## #5 2007-03-21 14:27:06

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

### Re: helppers absolutely needed..

It depends on where the centre of dilation is. Presumably its the origin?

An origin-centred dilation of 2 simply multiplies everything by 2. So the new vertices of your dilated triangle will be A′(2,4), B′(0,10), C′(10,8).

[Aside: When I hit Submit and post this, I will be a Power Member  yay!]

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## #6 2007-03-21 14:37:55

alison
Guest

### Re: helppers absolutely needed..

thnx guys...and congratulations on the powermember Jane! your my life saver!:D