Question

if these two shapes are similar, what is the measure of the missing length y?
15 mm
20 mm
12 mm
y = \boxed{} millimeters
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Explanation:

Step1: Find similarity ratio

$\text{Ratio} = \frac{12}{15} = \frac{4}{5}$

Step2: Set up proportion for $y$

$\frac{y}{20} = \frac{4}{5}$

Step3: Solve for $y$

$y = 20 \times \frac{4}{5}$

Answer:

16 millimeters