6. Which of the following is not a characteristic of the figure with vertices at coordinates \( A(1,1), B(1,2), C(2,2) \), and \( D(2,1) \) ? F. four right angles G. four vertices H. two sets of parallel lines I. two acute angles Course 1. Chapter 9 Area

The figure with vertices at \( A(1,1), B(1,2), C(2,2), \) and \( D(2,1) \) is a rectangle. Rectangles always have four right angles, four vertices, and two sets of parallel lines. However, rectangles do not contain acute angles, making option I, "two acute angles," the odd one out. To visualize it better, draw a quick sketch of these points on a coordinate grid. You’ll see that connecting them forms a perfect rectangle, with all angles at 90 degrees. Such visual aids can help solidify understanding of geometric concepts!