In calculate basic area fix text description that we expect 6.0 instead of 6.00 because the test will check for 1 digit only.

In Exercise 2, we should specify that we are always dealing with floats, never integers. Fix the example line:

Example: length=2, width=3, unit="m" should return "60000.0 cm^2" (because 2m × 3m = 6m² = 60000cm²)

to

Example: length=2.0, width=3.0, unit="m" should return "60000.0 cm^2" (because 2m × 3m = 6m² = 60000cm²)

In Exercise 2: in the text (part 2 and 3), make it clear that the default unit is always cm