One half = 1:2 or 0.5
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A scale factor requires two measures.
To find the scale factors of two objects, you need to compare the ratios of things like their sizes, areas, volumes, and length. For example, if one is given a volume of 7 for a shape, and a second shape has a volume of 14, you have to compare the volume ratio of these two shapes to find the scale factor. This scale factor is 1 to 2, or the volume of the second shape is twice the first one. Scale factors are useful for scale drawings.
It depends on the aspect ratio. If it is a square object then it should scale up evenly. But if it is a rectangle then eventually a large enough scale factor will make it looked stretch on the longer sides.
You find the scale factor on a triangle by dividing the short side by the long side.
If the scale factor is r, then the new area will be the area of the original multiplied by r^2