Angles in triangles (age 10+)

Find unknown angles in triangles, quadrilaterals, and regular polygons using angle sum properties

Usually learned at ages 10–11

Builds on: Types of angles (age 8+), Classifying shapes by properties, Angle Sum Rules

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On the map from: Marble Skill Taxonomy (v1), © Generative Spark, Inc. (withmarble.com), text CC BY-SA 4.0, database ODbL 1.0: https://github.com/withmarbleapp/os-taxonomy