Angle sums in triangles and polygons

Derive and use the angle sum in a triangle (180°), use it to deduce the angle sum in any polygon ((n−2) × 180°), and calculate interior and exterior angles of regular polygons

Usually learned at ages 11–14

Builds on: Angles in triangles (age 10+), Algebraic Notation (helps), Understanding angles (age 11+)

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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