Triangle Trouble

Geometry Level 3

The diagram shows an equilateral triangle of side length 3 cm3\text{ cm}, made by tessellating smaller equilateral triangles of side length 1 cm1\text{ cm}. How many such 1 cm1\text{ cm} triangles would a larger equilateral triangle of side length 1.25 m1.25\text{ m} contain?

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