Answer:
5/2 is the scale factor.
Step-by-step explanation:
To calculate scale factor, divide the similar sides.
According to the problem, EFGH is the drawing, or the "result".
Divide a side of the result by the original.
EFGH / ABCD = scale factor
We can use the widths.
Width of EFGH / Width of ABCD
= 10 / 4
= 5/2
Check using the lengths:
Length of EFGH / Length of ABCD
= 20 / 8
= 5/2
The scale factor is 5/2.
