Number of diagonals of a polygon, n(n - 3)/2

This type of question, asked 2 times: 18 Sep 2025 S1, 26 Sep 2025 S2. All 2 questions below, oldest first.

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Question 1
18 Sep 2025 S1
67 $The number of diagonals in a hexagon is:$
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Question 2
26 Sep 2025 S2
57 $The sum of the interior angles of a regular polygon is six times the sum of its exterior angles. Determine the number of diagonals in the polygon.$
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