Question

what is the scale factor from the original figure to the scaled copy? what is the missing length in the scaled copy? original scaled copy

Explanation:

Step1: Recall scale - factor formula

The scale factor $k$ is used to find the lengths in the scaled - copy. The formula for finding a length $l_{s}$ in the scaled - copy from a length $l_{o}$ in the original is $l_{s}=k\times l_{o}$. We know the scale factor $k = 0.5$, and the original length corresponding to the missing length in the scaled - copy is $l_{o}=4$.

Step2: Calculate the missing length

Substitute $k = 0.5$ and $l_{o}=4$ into the formula $l_{s}=k\times l_{o}$. So $l_{s}=0.5\times4$.
$l_{s}=2$

Answer:

2