Back to Mathematical Olympiad
Difficulty: 2/102023 NMTC 2023 (QII-64)

There are 6 equally spaced points A, B, C, D, E and F marked on circle with radius R. How many convex heptagons of distinctly different areas can be drawn using these points as vertices?

Guide / Hint

Hint 1: A heptagon requires 7 vertices.

Hint 2: How many points are marked on the circle to choose from? (6 points).

Hint 3: Since 6 is less than 7, is it possible to draw a heptagon?

Solution

Step 1 (Analyze Polygon Definition): A heptagon is defined as a polygon with exactly 7 vertices (and 7 sides).

Step 2 (Analyze available vertices): The problem states that there are 6 equally spaced points marked on a circle. To draw any polygon using these points as vertices, we must choose our vertices strictly from this set of 6 points.
Since the maximum number of available points is 6, it is mathematically impossible to choose 7 distinct vertices to draw a heptagon.

Step 3 (Conclusion): The number of convex heptagons that can be drawn is exactly 0.

Ready to track your progress and master these topics?

Create a free account
    2023 NMTC 2023 QII-64 - Olympiad Math Olympiad Question | Leminno