Final answer:
The precise perimeter can't be calculated with the information provided, as only the length of Ella's property is given and the question appears to have inconsistencies related to the shape of the property.
Step-by-step explanation:
The student is asking about the perimeter of a rectangle, wanting to calculate the total length of wire fence needed to enclose it. According to the formula given, P = 2l + 2w, where 'P' is the perimeter, 'l' is the length, and 'w' is the width. However, since the width 'w' is not provided in the question, and the details available do not align with the formula given (as they mention triangular and four-sided plots), we can't calculate the exact length of the fence needed for Ella's property. If we assume the question meant to provide the width, only then could we proceed to calculate 'P' with the given length 'l' = 13m.