The answer is one (A)
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Answer:
d
Step-by-step explanation:
Answer:

Step-by-step explanation:
is the equation for 4 sides.
divide the entire equation by 4 to get:

Answer:
So since you have the ratio of 1 : 4
we need to find 3 : x
since 1*3 = 3. We multiply all by 3
4*3 =12.
Answer is 12