12 true
expected 31 to equal -1

=> !??

• no sample tests
• specifications are incomplete again
• no random tests

Hi,

• your code is wrong. area is not pi d^2
• specs are incomplete (edge cases)
• no random tests
• this has already been done.

If you're interested in authroing kata, you really should start by reading the full documentation. Publishing this kind of kata, you'll only get frustrated with the feedback.
https://docs.codewars.com/authoring/guidelines/

Cheers