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10cm is roughly 4" and 15cm is roughly 6". It depends on how accurate you need to be though. 2.5cm is roughly the same as 1", but its not exactly the same.
100x150mm = 10X15cm = 6x4"
10 cm x 15 cm = 150 cm2 150 / 6.4516 sq in = 23.25 sq in