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GeoGebra
Interactive geometry, algebra and 3D in one classroom suite.
GeoGebra is a suite of free interactive math apps covering geometry, algebra, a CAS, 3D graphing and statistics, used widely in schools. Constructions are dynamic, so dragging a point updates everything built on it.
Best for: Use this when you need dynamic geometric constructions or symbolic math, not just plots.
Pros
- Covers geometry, CAS and 3D beyond plain graphing
- Huge library of community-made classroom activities
- Free on web, desktop and mobile
Cons
- Several overlapping apps can confuse newcomers
- More setup than a quick single-purpose calculator
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