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1 solution
In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles so:
10 of 1 unit² (1, 2, 3, 4, 5, 7, 8, 9, 10 and 11)
8 of 2 unit² (1-2, 1-5, 5-8, 8-9, 3-4, 4-7, 7-11 and 10-11)
2 of 3 unit² (1-5-8 and 4-7-11)
1 of 9 unit² (2-3-6-9-10)
2 of 12 unit² (1-2-3-5-6-8-9-10 and 2-3-4-6-7-9-10-11)
1 of 15 unit², the entire figure.
A total of 24