How many diagonals does a convex hexagon have?
Answer and explanation
Correct answer: A. 9, because each of 6 vertices joins 3 others and 18 is halved
- Step 1: Each vertex connects to n - 3 = 3 non-adjacent vertices. Step 2. Total = 6 x 3 / 2 = 9, since each diagonal is counted twice. Answer: 9. Why not the others: 15 counts every pair, including the six sides.
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