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Australian AMC 2013 - Intermediate Question 10

AMC AUSTRALIA · Australian AMC 2013 - Intermediate

Question 10

A piece of paper in the shape of an equilateral triangle has one corner folded over, as shown.

Question illustration

What is the value of x?
  1. 60
  2. 70
  3. 80
  4. 90
  5. 100