You need to fix some issues: you only have one test working, you are rounding to 3 decimal places, and the last test case is false (it should give 502.655)
also you shouldn't use isequal when you use pi.
The test suite has been updated.
The variable tolerance has not been set.
The value of pi is wrong, but so it is the test suite.
Make a checkerboard matrix
Is my wife right? Now with even more wrong husband
Back to basics 19 - character types
Reverse a matrix
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