Question

what is the missing length in the scaled copy?
original rectangle with length 90 and height 45. scaled copy rectangle with length 30 and height? (with a calculator interface shown)

Explanation:

Step1: Find the scale factor

$\text{Scale factor} = \frac{\text{Scaled length}}{\text{Original length}} = \frac{30}{90} = \frac{1}{3}$

Step2: Calculate missing scaled length

$\text{Missing length} = 45 \times \frac{1}{3}$

Answer:

15 units