How many diagonals does a convex polygon with 10 sides have?
Answer and explanation
Correct answer: C. 35
- Step 1: From each vertex there are diagonals, giving ends of diagonals. Step 2. Each diagonal has two ends, so the number is . Answer: 35. Why not the others: 70 counts every diagonal twice, 45 is , which also counts the 10 sides, and 7 is the number of diagonals from a single vertex.
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