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Australian AMC 2019 - Senior Question 18

AMC AUSTRALIA · Australian AMC 2019 - Senior

Question 18

For what values of $x$ does the triangle with side lengths 5,5 and $x$ have an obtuse angle?

Question illustration
  1. $0\lt x\leq5\sqrt2$
  2. $5\lt x\leq5\sqrt2$
  3. $5\lt x\lt 10$
  4. $0\lt x\lt 10$
  5. $5\sqrt2\lt x\lt 10$