[Axsasf]

Description

Fixed an empty IllegalArgumentException message in the surfaceAreaPyramid method of Area.java.

Changes Made

• Replaced the empty exception message with "Must be a positive sideLength".
• Improved the error message when the side length is zero or negative.
• Left the remaining functionality unchanged.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.22%. Comparing base (8b49bc5) to head (8e2bbc0).

Files with missing lines	Patch %	Lines
src/main/java/com/thealgorithms/maths/Area.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7723      +/-   ##
============================================
- Coverage     82.23%   82.22%   -0.01%     
  Complexity     8402     8402              
============================================
  Files           843      843              
  Lines         26140    26140              
  Branches       5100     5100              
============================================
- Hits          21495    21493       -2     
- Misses         3853     3854       +1     
- Partials        792      793       +1     

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[Axsasf]

The updated validation messages clearly explain that both sideLength and slantHeight must be positive. This makes invalid input errors easier to understand.