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 two rectangles are scaled - copies, the ratios of corresponding sides are equal. So, $\frac{x}{45}=\frac{30}{90}$.

Step2: Cross - multiply

$90x = 45\times30$.

Step3: Solve for $x$

$x=\frac{45\times30}{90}=\frac{1350}{90}=15$.

Answer:

15