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. We have the proportion $\frac{x}{45}=\frac{30}{90}$.

Step2: Cross - multiply and solve for $x$

Cross - multiplying gives $90x = 45\times30$. Then $90x=1350$. Dividing both sides by 90, we get $x=\frac{1350}{90}=15$.

Answer:

15