Problem 21 · 2011 Math Kangaroo
Hard
Spatial & Visual Reasoning
tiling-tessellationspatial-reasoning
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Answer: D
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Hint 1 of 2
The big pattern is built from small triangles of one size and shape.
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Hint 2 of 2
A tile that uses a different size or includes a square cannot tile the triangular pattern.
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Approach: match the tile to the triangle grid
- The pattern is made only of identical small triangles fitting a triangular grid.
- Each correct tile must be cut from that same triangle grid; the tile in option D does not fit that grid, so it cannot have been used.
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