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EEJ MAIN Aptitude QUESTION #11014
Question 1
How many distinct diagonals does a regular decagon (10-sided polygon) have?
  • $20$
  • $25$
  • $35$✔️
  • $45$
Correct Answer Explanation
An $n$-sided polygon has $\frac{n(n-3)}{2}$ diagonals. For $n=10$: $\frac{10 \times 7}{2} = 35$.