For n = 5, sum is 540°; for n = 6, 720°; for n = 7, 900°. General formula: (n – 2) × 180°. Proof: Drawing all diagonals from a single vertex divides the n-gon into n – 2 triangles, ...
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For n = 5, sum is 540°; for n = 6, 720°; for n = 7, 900°. General formula: (n – 2) × 180°. Proof: Drawing all diagonals from a single vertex divides the n-gon into n – 2 triangles, ...