12, right?
Yes. That’s how many I counted.
How can you count something that isn’t there?
Behold! The invention of negative numbers.
You can see that there are 4 rows where tiles are missing, and you can use the minimum and maximum size of the adjacent tiles in a row to assume how many can fit in each row, because the lines formed by edges WILL all line up. It’s all about deciding where the boundaries are.
Assuming they are square tiles, yes. It’s also possible to tile the area with 6 2x1 tiles.
But all the tiles around the hole are squares
More like 4 2×1 tiles:
Those are not 2x1 tiles.
I kept trying to find out why it would be 9. Until I saw the community name.
I’m still confused as to how the original guy came to the conclusion of 9. Like, what was he seeing incorrectly?
I can see how he might have counted 8 but that last one is a mystery.
Even if, because of the angle, you mistook it for being smaller, it’d be 8, not 9.