Ring of side length 4 (12 blocks) and 1 block by itself. 2 squares.
9+4 - Don't understand the task in fact, and how am I supposed to give an answer? attach picture? :)
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The task does not say, that these building blocks are all equal :), so in many ways.
imposible
3x3 and 2x2 squares (9+4=13)
9
4 + 9
9/4
Don't know
many ways. depends on shape of building blocks. if they are cubes, 9 and 4.
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3x3+2x2
depends on block size - it might be that 2 blocks make 1 square - then use 4 blocks and make 2 squares and keep the rest :D
one is from 4 square blocks, other from 9 same blocks(with 1 inside)
√9 + √4 = 13
Use only 8 of them
3² and 2²
squares with 9 and 4 building blocks