Question

figure b is a scale copy of figure a. circle the scale factor that was used to draw figure b. 7 in. 3.5 in. 2 in. 1 in. a b 1/3 1/2 2 3

Explanation:

Step1: Recall scale - factor formula

The scale factor $k$ from figure $A$ to figure $B$ is given by $k=\frac{\text{corresponding side length in }B}{\text{corresponding side length in }A}$.

Step2: Select corresponding side lengths

Let's use the longer side lengths. The length of the longer side in figure $A$ is $7$ inches and in figure $B$ is $3.5$ inches.

Step3: Calculate the scale factor

$k = \frac{3.5}{7}=\frac{1}{2}$

Answer:

$\frac{1}{2}$