Question

figure b is a scale copy of figure a. circle the scale factor that was used to draw figure 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 the ratio of corresponding side - lengths, $k=\frac{\text{side - length in figure B}}{\text{side - length in figure A}}$.

Step2: Choose a pair of corresponding sides

Let's use the base - lengths. The base - length of figure $A$ is $7$ inches and the base - length of figure $B$ is $3.5$ inches.

Step3: Calculate the scale factor

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

Answer:

$\frac{1}{2}$