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The bottom right corner angle of the quadrilateral on the right-hand diagram must be 180°-61° = 119°.

But the upper right corner angle of the folded triangle in that diagram must be 180°-61°-60° (angle sum of triangle) = 59°.

So 60° (lower left angle) + 60° (top angle) + n + 59° + 119° = 360° (angle sum of quadrilateral).

Therefore n = 62°.

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