# How do you find the scale factor of similar figures?

## How do you find the scale factor of similar figures?

Suppose you have two similar figures , one larger than the other. The scale factor is the ratio of the length of a side of one figure to the length of the corresponding side of the other figure. Here, XYUV=123=4 . So, the scale factor is 4 .

How do you calculate scale factor?

The basic formula to find the scale factor of a figure is: Scale factor = Dimensions of the new shape ÷ Dimensions of the original shape. This can also be used to calculate the dimensions of the new figure or the original figure by simply substituting the values in the same formula.

What is the scale factor of 2 triangles?

When two triangles are similar, the reduced ratio of any two corresponding sides is called the scale factor of the similar triangles. In Figure 1 , Δ ABC∼ Δ DEF. Figure 1 Similar triangles whose scale factor is 2 : 1. The ratios of corresponding sides are 6/3, 8/4, 10/5.

### What is a scale factor in math in 7th grade?

7th Grade Math – Scale Drawings Lesson. 1 of 5 – view full lesson. Similar figures are the same shape, but not necessarily the same size. Scale factor is the ratio of corresponding side lengths. (new image to old image) of similar figures.

What is the area of two similar triangles?

The ratio of the area of two similar triangles is equal to the square of the ratio of any pair of the corresponding sides of the similar triangles. For example, for any two similar triangles ΔABC and ΔDEF, Area of ΔABC/Area of ΔDEF = (AB)2/(DE)2 = (BC)2/(EF)2 = (AC)2(DF)2.

What is the scale factor in math mean?

VOCABULARY. ● Scale Factor: The ratio of any two corresponding lengths in two similar. geometric figures.

#### How do you find the scale factor of a triangle?

Divide one of the sides in the bigger triangle by its corresponding side in the smaller triangle to determine the scale factor for the smaller triangle to the bigger triangle. In the example, if you divided 40 by 20 you would get a scale factor of 2.

How to find the scale factor of a triangle?

Set up ratios of the corresponding sides of the triangles. For example, the ratio of small to big triangle sides in two triangles is 5/10, 10/20 and 20/40. Divide both numbers in one of the ratios by their highest common factor. This will give you the scale factor of the bigger triangle to the smaller triangle.

How do you determine scale factor for two similar figures?

In two similar geometric figures, the ratio of their corresponding sides is called the scale factor. To find the scale factor, locate two corresponding sides, one on each figure. Write the ratio of one length to the other to find the scale factor from one figure to the other.

## What is a scale factor on a triangle?

Scale Factor of Triangle The triangles which are similar have same shape and measure of three angles are also same. The only thing which varies is their sides. However, the ratio of the sides of one triangle is equivalent to the ratio of sides of another triangle , which is called here the scale factor .