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grade 10 · GEOM-006

Find a polygon angle sum

Use a triangulation from one vertex to explain the interior-angle sum formula.

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Try with a hintFresh problem · seed 1949922410

What is the sum of the interior angles of a 9-sided polygon?

Give me one hint

Draw diagonals from one vertex.

Your answer

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Math Lab is a working name for Ready Rung's separate math-learning product. Guided success and independent evidence are reported separately.