123 free lessons · A guided path
Geometry
Give your ideas a shape.
Measure the world, reason about shapes, and connect everyday spaces to coordinates and curved surfaces.
Explore the path ↓Find a comfortable starting point
One subject. Many levels of understanding.
Start with a familiar idea and move forward when the reasoning feels clear. Each lesson states its prerequisites. Grade is your first guide; the stages below describe the challenge within this subject, rather than a single school year. Extension lessons introduce selected advanced topics.
Foundations
Build intuition, name the quantities, and explain the basic idea.
35 lessons
Developing
Connect familiar ideas and choose a useful representation for a problem.
37 lessons
Intermediate
Combine methods, compare approaches, and justify the steps you take.
25 lessons
Advanced
Use deeper tools and check the assumptions behind a model or argument.
19 lessons
Extension
Meet selected university and research ideas after reviewing their prerequisites.
7 lessons
Your geometry lesson library
Choose the idea you want to explore.
Filter by grade or topic difficulty, or search for a particular skill. The collection includes every geometry lesson, with 12 shown at a time so you can browse at your own pace.
Showing 12 of 123 matching lessons · All free
GeometryGrade 1 · Foundations 6 min
Order objects by length
Compare lengths by aligning one endpoint.
Read, practice, and reflectGeometryGrade 1 · Foundations 6 min
Measure with equal units
Measure length using repeated units without gaps or overlaps.
Read, practice, and reflectGeometryGrade 1 · Foundations 6 min
Read whole hours
Read an analog clock when the minute hand points to twelve.
Read, practice, and reflectGeometryGrade 1 · Foundations 6 min
Sort flat shapes by their sides
Identify triangles and quadrilaterals from sides and corners.
Read, practice, and reflectGeometryGrade 1 · Foundations 6 min
Notice flat and curved surfaces
Distinguish basic solid shapes by observable surfaces.
Read, practice, and reflectGeometryGrade 1 · Foundations 6 min
Split a whole into equal halves
Recognize two equal-size parts as halves.
Read, practice, and reflectGeometryGrade 1 · Foundations 6 min
Four equal shares
Recognize quarters as four equal parts of one whole.
Read, practice, and reflectGeometryGrade 2 · Foundations 6 min
Recognize three equal shares
Name one of three equal parts as a third.
Read, practice, and reflectGeometryGrade 2 · Foundations 6 min
More equal pieces means smaller pieces
Compare a half and a quarter of the same whole.
Read, practice, and reflectGeometryGrade 2 · Foundations 6 min
Measure from a ruler's zero mark
Use interval differences when measuring with a ruler.
Read, practice, and reflectGeometryGrade 2 · Foundations 6 min
Choose centimetres or metres
Connect one metre to one hundred centimetres.
Read, practice, and reflectGeometryGrade 2 · Foundations 6 min
Read minutes in fives
Use clock numbers as groups of five minutes.
Read, practice, and reflectGive the idea a shape.
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