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A trapezium has upright lines from its top corners to the base, and the square between them has both diagonals. How many triangles are there?

Competition practiceCounting Figures
  • A8
  • B10
  • C14
  • D12

Step-by-Step Solution

Inside the square: 4 quarters and 4 halves, 8. The 2 corner triangles at the ends, and each corner triangle joined to the square's half next to it, 2. Total .
Answer: D) 12

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