Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines

What you'll learn

1. Classify two-dimensional figures based on the presence or absence of parallel lines (e.g., parallelogram has two pairs, trapezoid has exactly one pair, triangle has none)
2. Classify two-dimensional figures based on the presence or absence of perpendicular lines (e.g., rectangle has four pairs of perpendicular adjacent sides, rhombus may or may not)
3. Classify two-dimensional figures based on the presence or absence of angles of a specified size (right, acute, obtuse)
4. Recognize right triangles as a category and identify right triangles among a set of triangles
5. Use the properties of parallel lines, perpendicular lines, and angle types as the basis for classification — not just the shape's name

Prerequisites

• Draw points, lines, line segments, rays, angles, and perpendicular and parallel lines