Question

original scaled copy
4?
10 5
what is the scale - factor from the original figure to the scaled copy?
original
10
4
scaled copy
5
?

Explanation:

Step1: Recall scale - factor formula

The scale factor $k$ from the original to the scaled - copy is given by the ratio of a side - length of the scaled - copy to the corresponding side - length of the original. We can use the known side - lengths: original length is 10 and scaled - copy length is 5.
$k=\frac{\text{Scaled Copy Length}}{\text{Original Length}}$

Step2: Calculate the scale factor

Substitute the values into the formula: $k = \frac{5}{10}=\frac{1}{2}=0.5$

Answer:

$0.5$