Draw and identify lines and angles, and classify shapes by properties of their lines and angles.

4.G.1 Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Lines, rays and line segments

Lines, Rays and Line Segments

Types of angles

Types of Angles

Parallel and perpendicular lines

Parallel and Perpendicular Lines

4.G.2 Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

Right angle

Right Angle

Types of triangles

Types of Triangles

Classify figures based on parallel sides

Classify Figures based on Parallel Sides

4.G.3 Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.

Lines of symmetry

Lines of Symmetry