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 lengths of the scaled copy and the original. Given that the 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 corresponding to the side of length 10 in the original is found by multiplying the original side length by the scale - factor. So the missing side length $=10\times k$. Substituting $k = 3$, we get $10\times3=30$.

Answer:

30