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**alison****Guest**

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???

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

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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**alison****Guest**

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.

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

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

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

It depends on where the centre of dilation is. Presumably its 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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**alison****Guest**

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

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