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The cross-shaped figure is made of a central square of side $$1.5\ \text{cm}$$ and four arms, each a rectangle of length $$2.5\ \text{cm}$$ and width $$1.5\ \text{cm}$$. The central square has area $$1.5 \times 1.5 = 2.25\ \text{cm}^2$$ and the four arms together have area $$4 \times 2.5 \times 1.5 = 15\ \text{cm}^2$$. So the total area is $$2.25 + 15 = 17.25\ \text{cm}^2$$.
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