Public learning track
Lines, Rays, Line Segments, and Intersections
3rd Grade · Math · Open Global Math
8 lessons
Goal
Identify and draw points, lines, line segments, rays, horizontal, vertical, oblique, parallel, and perpendicular lines, and understand paths between points.
Featured Diagrams
Points, Lines, Line Segments, and Rays
8 lessons
0 of 8 done
- 1Points, Lines, Line Segments, and RaysUp nextStart
- 2Drawing Accurate Line Segments with Rulers to the MillimeterPremiumNot started yet
- 3The Shortest Distance Between Two PointsNot started yet
- 4Identifying Horizontal, Vertical, and Oblique LinesNot started yet
- 5Parallel Lines in Shapes and the EnvironmentNot started yet
- 6Perpendicular Lines and Right-Angle IntersectionsNot started yet
- 7Intersecting Lines and Intersection PointsNot started yet
- 8Drawing Polygonal Paths and Closed BoundariesNot started yet
Standards Covered
- OGM.4.G.3Open Global Math Standards 2026™ · Math · Level 4 / Grade 3 (Age 8) · Grade 3Recognize line segments, rays, and straight lines; identify horizontal, vertical, oblique, parallel, and perpendicular lines; understand that the shortest line between two points is a line segment and use straightedge/rulers to draw line segments and polygonal paths.
- OGM.4.G.4Open Global Math Standards 2026™ · Math · Level 4 / Grade 3 (Age 8) · Grade 3Understand angles as geometric attributes and dynamic measures of turn; identify right angles, acute angles, obtuse angles, straight angles, and full rotations; compare angles to right angles (half-turns, 3/4 turns, full turns); draw and measure benchmark angles (30°, 45°, 60°, 90°) using protractors and set squares.
Curriculum Framework
3rd Grade · Math · Open Global Math
1
8 lessons
Lines, Rays, Line Segments, and Intersections
Identify and draw points, lines, line segments, rays, horizontal, vertical, oblique, parallel, and perpendicular lines, and understand paths between points.
2
9 lessons
Angles as Turns, Classification, and Protractor Measurement
Understand angles as geometric turns, classify acute, right, obtuse, and straight angles, and measure and draw benchmark angles using protractors.
3
8 lessons
Classifying and Comparing 2D Shapes: Triangles and Quadrilaterals
Classify, describe, and compare triangles and quadrilaterals by side lengths, angle types, and parallel or perpendicular side properties.
4
6 lessons
Partitioning Shapes and Equal-Area Fractions
Partition 2D shapes into equal-area parts, represent each part as a unit fraction of the whole, and understand that equal-area parts can have different shapes.
5
7 lessons
Three-Dimensional Solids, Faces, Edges, Vertices, and Nets
Analyze properties of 3D solids (prisms, pyramids, cylinders, cones, spheres), connect solids to 2D nets, and construct 3D geometric models.
6
7 lessons
Symmetry, Reflections, Translations, and Rotations
Identify lines of symmetry, perform and describe reflections, translations, and rotations, and analyze geometric patterns in nature and art.
7
9 lessons
Grid Coordinates, Maps, Compass Directions, and Multi-View Perspectives
Read and create grid maps, navigate using cardinal and intercardinal compass directions and perspective relative positions, and interpret multi-view elevations of 3D objects.