Folding a rectangular sheet of paper

Geometry Level 1

A rectangular sheet of paper is folded as shown. What is the other side length of the orginal sheet?


The answer is 18.

Ronald Chén by Ronald Chén , 32, Guatemala

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2 solutions

Chew-Seong Cheong
Dec 19, 2018

It is obvious from the figure that the other side length is 12 + 6 = 18 12+6 = \boxed{18} .

10 Helpful 5 Interesting 7 Brilliant 1 Confused
Edwin Gray
Apr 17, 2019

Let the other side be 12 + x. When x is folded over, it must be 1/2 of the vertical length, which is 12. So x = 6, and the other side = 18.

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