Respuesta :
Answer:
24in
Step-by-step explanation:
Set up the equation, 12 + 12 + 3 + 3 + x = 36. Add the lengths of the known sides (12 + 12 + 3 + 3). Subtract 30 feet from both sides of the equation to find the value of x. Add the lengths of all the sides to find the perimeter.