Grade 4 Medium β€’ Geometry

Classifying Angles: Acute, Right, Obtuse

Classify geometric angles based on degree benchmarks: acute (<90Β°), right (90Β°), obtuse (>90Β°), and straight (180Β°).

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Comprehensive Lesson Guide: Classifying Angles: Acute, Right, Obtuse


Benchmark Angles:


- Acute: Less than $90^\circ$ ("a cute little angle").
- Right: Exactly $90^\circ$ (forms a square corner).
- Obtuse: Greater than $90^\circ$ and less than $180^\circ$.
- Straight: Exactly $180^\circ$ (a flat line).

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