Am I stupid? (What is the circumference?)

Please, tag anwsers as spoilers before posting, I still didn't crack it.

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Spoiler 

@Inginsub
Fuck me, I didn't see it without a paper.

And I had to use an actual equasion. Mark one side (and middle) as 9+x and the second as 9-x
So... 30

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Spoiler 

@Inginsub
Well, this is what a 3rd grade looks like (supposedly) these days in Czech Republic.

Spoiler 

@LukeAlmighty @Inginsub no I did the math off, it's 30

Spoiler 

@Inginsub @LukeAlmighty I don't know why in my mind I did a 5+4=10

re: Spoiler 

@LukeAlmighty yeah, it's kinda like "clearly not enough data... what's the upper bound?.. oh shit"
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