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Answer:

The missing side is 12.

Step-by-step explanation:

To find the answer you want to divide the sides that are similar.

15/5=3

9/3=3

Both answers are three so you want to multiply 4 by 3 which equals 12.

dommalb

Answer:

The missing side is 12.

Step-by-step explanation:

divide the sides that are similar.

15/5=39/3=3

Both answers are three so you want to multiply 4 by 3 which will equal 12.