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In a tiling of equilateral triangles, how many triangles share a whole edge with one given triangle?

Class 7Tiling PatternsGeometry
  • A4
  • B12
  • C3
  • D6

Step-by-Step Solution

A triangle has 3 edges, and each edge is shared with exactly one other triangle. (Many more touch it only at a corner.)
Answer: C) 3

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