I don't understand. Please, help
How many diagonals are there in a polygon with 9 sides?
The answer is 36
Stacey Warren - Expert brainly.com
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With 9 nodes, we pick 2 nodes to form a diagonal, hence there is 9C2 ways to get the diagonals that is 36 ways
maybe instead of diagonals, they just meant how many segments were possible
They confuse me a lot. I interpreted it as above, we pick 2 vertices to form a diagonal, hence 9C2 is what they did. But the formula on your site tells me other thing. That's why I make question here.
One more thing, 9C2 is a valid logic, right?
or maybe they redefined "diagonal", but that doesn't make much sense really
Ok, let me try on smaller number of sides of a polygon. Thanks for clarifying it.
Yes, I think your site is better, just look at a rectangular. Obviously it has 2 diagonals, but if 4C2 = 6 which is total segments on a rectangular, hhehehe.!!!