Final answer:
Without detailed measurements of Jessica's room, we can't calculate the actual perimeter. However, with your conversion of 1 cm to 3 m, you can convert any centimeter measurement to meters by multiplying by 3. Please provide the perimeter in centimeters to find the correct answer.
Step-by-step explanation:
It looks like there has been a mix-up in your question regarding Jessica's room perimeter. However, you provided conversion information that 1 cm equals 3 m, which would be unusually large for practical conversions, but we'll use that to demonstrate the process.
Presuming you have the perimeter measured in centimeters (for example, a 12-meter room would be 4 cm with this conversion), you could convert the perimeter to meters by multiplying the centimeter value by 3.
However, without knowing the actual perimeter in centimeters, we can't calculate the meters. If you meant to ask a different question, such as the calculation of the perimeter of a rectangular area based on given dimensions, you can use the formula P=2(l+w), where P is the perimeter, l is the length, and w is the width.