Public learning track
Measuring, Drawing, and Classifying Angles
4th Grade · Math · Open Global Math
8 lessons
Goal
Understand angles as circular turns, measure and construct angles using a protractor and set square, and classify angles from acute to full revolutions.
Featured Diagrams
Understanding Angles as Turns and Circular Arcs
8 lessons
0 of 8 done
- 1Understanding Angles as Turns and Circular ArcsUp nextStart
- 2Classifying Acute, Right, Obtuse, Straight, and Reflex AnglesPremiumNot started yet
- 3Recognising That Four Right Angles Make a Complete TurnNot started yet
- 4Using a Protractor to Measure Acute and Obtuse AnglesNot started yet
- 5Measuring Reflex Angles Using ProtractorsNot started yet
- 6Drawing Angles Using a Protractor and RulerNot started yet
- 7Using a Set Square to Construct and Verify Right AnglesNot started yet
- 8Estimating Angle Measures in Real-World ContextsNot started yet
Curriculum Framework
4th Grade · Math · Open Global Math
1
6 lessons
Points, Lines, Segments, Rays, and Geometric Primitives
Identify, draw, and define fundamental geometric primitives including points, lines, segments, rays, parallel and perpendicular lines, midpoints, and bisectors.
2
8 lessons
Measuring, Drawing, and Classifying Angles
Understand angles as circular turns, measure and construct angles using a protractor and set square, and classify angles from acute to full revolutions.
3
6 lessons
Angle Properties and Additive Decomposition
Solve additive angle decomposition problems involving adjacent angles, angles on straight lines, angles around a point, and vertically opposite angles.
4
6 lessons
Classifying Triangles and Triangle Properties
Classify triangles by both side lengths and angle measures, understand that triangle interior angles sum to 180°, and solve for missing angles.
5
6 lessons
Quadrilaterals and Polygons: Hierarchy and Properties
Classify quadrilaterals based on side, angle, and parallel relationships, explore polygon classifications, and derive quadrilateral angle sums.
6
5 lessons
Circles: Parts, Radius, Diameter, and Chords
Identify and define key parts of a circle including center, radius, diameter, and chord, understand the relationship d = 2r, and construct circles.
7
8 lessons
Lines of Symmetry, Rotational Symmetry, and Transformations
Identify and draw line symmetry and rotational symmetry in 2D shapes, complete symmetrical figures across mirror lines, and recognize translations.
8
7 lessons
Coordinate Graphing, Bearings, and Directional Pathways
Plot and read coordinates in the first quadrant, navigate using 8 compass bearings and clock-face directions, and complete geometric polygons on coordinate planes.
9
8 lessons
Three-Dimensional Solids: Nets, Views, and Cross-Sections
Classify 3D solids, analyze faces, edges, vertices, cross-sections, and unfolding nets, and construct composite 3D shapes from multiple viewing perspectives.