Question

what is the missing length in the scaled copy? units original scaled copy

Explanation:

Step1: Find the scale - factor

The scale - factor is the ratio of the corresponding side lengths of the scaled copy to the original. For the known side lengths, the scale - factor $k=\frac{50}{25}=2$.

Step2: Calculate the missing length

Multiply the corresponding side length of the original by the scale - factor. The missing length $l = 40\times2=80$.

Answer:

80