how do we find the scale factor
http://www.watertown.k12.ma.us/wms/math/math_help/gradeseven/stretching/scale%20factor.htm
http://www.youtube.com/watch?v=XtkU4VkWh8I
go on scale factor wikipedia
it will explain everything to you and if not then:
The ratio of any two corresponding lengths in two similar geometric figures is called as Scale Factor. In the equation y=Cx, C is the scale factor for x. C is also the coefficient of x, and may be called the constant of proportionality of y to x
Hope this helps :)
To find the scale factor, you need to compare the corresponding lengths, areas, or volumes of two similar figures. The scale factor is the ratio of these corresponding measurements.
Here are the steps to find the scale factor:
1. Identify the corresponding measurements: Look at the corresponding sides, areas, or volumes of the two similar figures you are comparing. For example, if you have two similar rectangles, compare the lengths of corresponding sides.
2. Determine the ratio: Divide the measurement of the corresponding side, area, or volume of the first figure by the corresponding measurement of the second figure. This will give you the scale factor.
3. Simplify the ratio: If necessary, simplify the ratio to its simplest form. For example, if the ratio is 8:2, you can simplify it to 4:1.
4. Interpret the scale factor: The scale factor tells you how the measurements in the two figures relate to each other. For example, a scale factor of 2 means that every measurement in the first figure is twice as large as the corresponding measurement in the second figure.
Remember that the scale factor will be the same for all corresponding measurements (sides, areas, volumes) in two similar figures.