user: I'm working on a project that requires calculating the areas of various plots of land based on their corner points. For the first plot, the corners are at [1,2], [3,4], [1,4], and [3,7]; the second one has corners at [5,5], [6,7], and [7,5]; the third plot's corners are at [2,1], [4,2], [3,4], and [1,3]; and the fourth plot, which has an irregular shape, has corners at [-1,0], [2,3], [0,4], and [-2,2]. Could you provide the area calculations for these four plots?

Available functions:
name: polygon_area
description: Calculate the area of a polygon given its vertices using the shoelace formula.
parameters: type: dict
properties: vertices: type: array
items: type: array
items: type: float
description: A single vertex represented by a 2 element list [x, y].
description: The vertices of the polygon, where each vertex is a 2 element list [x, y].
required: vertices