1998 CEMC Gauss (Grade 7) Problems/Problem 17
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Problem
Claire takes a square piece of paper and folds it in half four times without unfolding, making an isosceles right triangle each time. After unfolding the paper to form a square again, the creases on the paper would look like:
(see attached pdf for diagrams)
Solution
For each fold, you are folding along the diagonal of the shape to form an isosceles triangle. The finished result should look like 
