Is it correct to call it degrees square?
Will it be the same if calculate the area using Plate Carrée projection?
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Degrees Squared or Square Degrees is a non-sensical term. Consider that lines of longitude converge at the poles. One square degree will be much smaller at the pole than at the equator.
Therefore, when calculating area, you should use a projected coordinate system. Preferably an equal area projection which preserves area. A common example of such a projection is the Albers projection.
Converting to a projected coordinate system where the units are in feet or metres will provide you with correct area units (square feet or square metres).
You will most certainly get a different area calculation than plate carrée which is not equal area.