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A rhombus has both diagonals drawn and one more line across its upper half, parallel to the horizontal diagonal. How many triangles are there?

Competition practiceCounting Figures
  • A8
  • B9
  • C12
  • D11

Step-by-Step Solution

At the top tip: 2 small triangles and the tip triangle made of both, 3. The diagonals give 4 quarter triangles and 4 halves of the rhombus, 8. Total .
Answer: D) 11

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