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https://math.answers.com/math-and-arithmetic/How_many_diagonal_lines_does_a_decagon_have

How many diagonal lines does a decagon have? - Answers

A diagonal line of a polygon is a line that joins any two vertices not already joined by a side. A polygon with n sides has n(n-3)/2 diagonals → a decagon has 10(10-3)/2 = 10 × 7 ÷ 2 = 35 diagonals



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How many diagonal lines does a decagon have? - Answers

https://math.answers.com/math-and-arithmetic/How_many_diagonal_lines_does_a_decagon_have

A diagonal line of a polygon is a line that joins any two vertices not already joined by a side. A polygon with n sides has n(n-3)/2 diagonals → a decagon has 10(10-3)/2 = 10 × 7 ÷ 2 = 35 diagonals



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https://math.answers.com/math-and-arithmetic/How_many_diagonal_lines_does_a_decagon_have

How many diagonal lines does a decagon have? - Answers

A diagonal line of a polygon is a line that joins any two vertices not already joined by a side. A polygon with n sides has n(n-3)/2 diagonals → a decagon has 10(10-3)/2 = 10 × 7 ÷ 2 = 35 diagonals

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      A diagonal line of a polygon is a line that joins any two vertices not already joined by a side. A polygon with n sides has n(n-3)/2 diagonals → a decagon has 10(10-3)/2 = 10 × 7 ÷ 2 = 35 diagonals

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