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Two equal squares sit side by side; each has both diagonals, and a flat line runs across both through their centres. How many triangles are there?

Competition practiceCounting Figures
  • A28
  • B18
  • C22
  • D24

Step-by-Step Solution

Take the smallest triangle as 1 unit. There are 8 of 1 unit, 10 of 2 units, 8 of 4 units and 2 of 8 units (the long triangles spanning both squares). Total .
Answer: A) 28

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