Question

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

Explanation:

Step1: Set up proportion

Let the missing length be $x$. Since the figures are scaled - copies, the ratios of corresponding sides are equal. We have the proportion $\frac{45}{x}=\frac{90}{30}$.

Step2: Cross - multiply

Cross - multiplying gives us $90x = 45\times30$.

Step3: Solve for $x$

First, calculate $45\times30 = 1350$. Then, $x=\frac{1350}{90}=15$.

Answer:

15