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A trapezium has two upright lines from the ends of its top side to the base, and one flat line across the middle. How many quadrilaterals are there?

Competition practiceCounting Figures
  • A6
  • B9
  • C14
  • D12

Step-by-Step Solution

Upper band: the top side is short, so of the 4 side lines only 4 pairs close a four-sided figure. Lower band: all pairs work. Full height: 4 again, as in the upper band. Total .
Answer: C) 14

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