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The corresponding value of t

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A very long rectangular piece of paper is 20 cm wide. The bottom right hand corner is folded along the crease so that the corner just touches the left hand side of the page. How should this be done so that the crease is as short as possible?

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The corresponding value of t is determined.

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Create the fold, with crease length C; this gives a right triangle with base x. Let t be the angle C makes with the base (x); hence

x/c = cos (t)

/ c
x /
/
______/_t_______

20 - x x

Upon folding, ...

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