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Which pair of consecutive whole numbers are the legs of a right triangle whose hypotenuse is also a whole number?

Class 7Pythagoras PropertyTriangles
  • A20 and 21
  • B10 and 11
  • C5 and 6
  • D8 and 9

Step-by-Step Solution

, a whole number. The others do not give a perfect square (e.g. 100+121=221, not a square).
Answer: A) 20 and 21

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