Question

if these two shapes are similar, what is the measure of the missing length y?
1 cm
3 cm
12 cm
y = \square centimeters
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Explanation:

Step1: Set up proportion for similar shapes

Since the shapes are similar, the ratios of corresponding sides are equal. So, $\frac{1}{y}=\frac{3}{12}$.

Step2: Solve for y

Cross - multiply: $3y = 1\times12$. Then, $y=\frac{12}{3}$.

Answer:

4