How to do you calculate scale factor ?

Ques: Find the scale factor from the larger rectangle to the smaller rectangle, if the two rectangles are similar. example of Scale Factor Choices:

A. 5:1

B. 5:6

C. 6:5

D. 6:7 Correct

Answer: B

SOLUTION:

 

Step 1: If we multiply the length of one side of the larger rectangle by the scale factor we get the length of the corresponding side of the smaller rectangle.

 

Step 2: Dimension of larger rectangle × scale factor = dimension of smaller rectangle

 

Step 3: 24 × scale factor = 20 [Substitute the values.]

 

Step 4: Scale factor = 20/24 [Divide each side by 24.]

 

Step 5: Scale factor =5/6= 5:6 [Simplify.]

 

Therefore, scale factor from the larger rectangle to the smaller rectangle is 5:6.

 

Here is the link: http://www.icoachmath.com/math_dictionary/scale_factor.html