How many total number of lines are needed to form a decagon with all its diagonals.

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A 35
B 55
C 65
D 45

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Answer: D. 45

Has 35 diagonals and 10 lines when we add it we will have 45 and it is the number of Total number of line we need to make a decagon with its diagonals.

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How many total number of lines are needed to form a decagon with all its diagonals.

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