Interactive experiments and lessons about angles

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SOHCAHTOA Explained: How to Choose Sine, Cosine or Tangent
Trigonometry

SOHCAHTOA Explained: How to Choose Sine, Cosine or Tangent

  • September 17, 2026
Interior Angles of Polygons: Why Triangles Always Add Up to 180°
Geometry

Interior Angles of Polygons: Why Triangles Always Add Up to 180°

  • September 16, 2026
Common Protractor Mistakes and How to Fix Them
Protractors

Common Protractor Mistakes and How to Fix Them

  • September 12, 2026
Acute, Obtuse, Reflex and Right: A Beginner's Guide to Angle Types
Geometry

Acute, Obtuse, Reflex and Right: A Beginner's Guide to Angle Types

  • September 11, 2026

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How to Measure an Angle with a Protractor: A Step-by-Step Guide for Beginners
Protractors

How to Measure an Angle with a Protractor: A Step-by-Step Guide for Beginners

  • September 10, 2026

A step-by-step walk through measuring angles with a protractor: aligning the centre on the vertex, choosing the correct inner or outer scale, and checking the reading.

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Interactive experiments and lessons about angles

Trigonometry
Trigonometry
Geometry
Geometry
Protractors
Protractors