Problem: A rectangular piece of paper 6 inches wide is folded as in the diagram so that one corner touches the opposite side. The length in inches of the crease in terms of angle is
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Answer Choices:
A.
B.
C.
D.
E. None of these
Solution:
Let denote the length of the sheet. Then h=\frac{6}{\cos \left(90^{\circ}-2 \theta\right)}=\frac{6}
Also .
