Question

find the missing side length, in units, in the scaled copy.
original scaled copy
5 15
10

Explanation:

Step1: Find the scale - factor

The scale - factor is found by dividing the corresponding side length of the scaled copy by the side length of the original. Given that a side of length 5 in the original corresponds to a side of length 15 in the scaled copy. The scale - factor $k=\frac{15}{5}=3$.

Step2: Calculate the missing side length

The missing side length in the scaled copy is found by multiplying the corresponding side length in the original by the scale - factor. The corresponding side in the original has length 10. So the missing side length $l = 10\times k$. Substituting $k = 3$, we get $l=10\times3 = 30$.

Answer:

30