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A seven sided figure has 14 diagonals. Each vertices has 4 diagonals (but of course some are shared diagonals). The best thing to do is draw a regular heptagon, draw all the diagonals (lines connecting non-adjacent vertices) in pencil and then go back with a red or blue pen and count the diagonals as you trace each line in the different color. AA

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15y ago
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Q: How many diagonal lines do a heptagon has?
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