The solution is not that complex but the convoluted description makes the kata harder than it should be. The lack of explained examples makes me vote the kata as 6 kyu.

this one was actually possible but i know what you mean...

I like how the whole point of this coding problem is not to teach myself coding techniques, but to brush up on my high school geometry by digging into how to get from an arc length to a diagonal of a square to the length of the side of the square to an area of a square. Maybe post a link to the place where we can find all of the information we need to do this simple math problem? This problem is not difficult, finding the exact relations from an arc length to the get to an area of a square is just time consuming if you aren't looking in the correct places.

Usually when non-trivial math (don't add me, doesn't look trivial to me) is featured there is at least a wikipedia link or something.
Without it an 8 kyu task becomes hard for no reason.

task with math function must not to be in 8 kyu

I can definitely sympathize with those that are frustrated with this kata. And there are no examples on the initial page. If I didnt have a fairly strong math background (math was a hobby of mine at one time) Im sure I would be in the same boat. In order to look things up, you need to know how to pose/phrase the question. Without that background knowledge your googled question is like a shot in the dark - youll be lucky to get what youre looking for. On the other hand, many katas are based on inside knowledge, and giving out this inside knowledge can turn a 6 kyu kata into an 8 kyu kata. btw can i upload an image like the one used in this kata, or do I have to give an address for it? Anyway, not a bad kata if one has some math background.

Yup, C++. I should have stated that earlier, my bad ^^'

Based on a recent support request on Discord, I think the OP means C++.

Tests in javascript should use chai and proper describe and it nesting structure.

Which language?

Too easy :) Should be ranked as 8kyu, I think.

If someone can answer man how my code passes final test but not sample tests ?

I always enjoy a good geometry kata, but it may help to stipulate that the arc is always 90°.
The description states the area is square (which implies 90°), but it could be a little more clear for an 8kyu kata.

Not 8kyu kata..