Teacher presentation materials. Unit: 4.8 Properties of Two-dimensional Shapes (Grade 4). 4.8 Properties of Two-dimensional Shapes Unit Goals Students classify triangles and quadrilaterals based on the properties of their side lengths and angles, and learn about lines of symmetry in two-dimensional figures. They use their understanding of these attributes to solve problems, including problems involving perimeter and area. Section A Goals Classify triangles (including right triangles), parallelograms, rectangles, rhombuses, and squares based on the properties of their side lengths and angles. Identify and draw lines of symmetry in two-dimensional figures. Section B Goals Solve probl