(465) 3

Part of 1995 Tournament Of Towns

Problems(1)

TOT 465 1995 Autumn J O3 folding paper rectangle

Source:

A paper rectangle

ABCD

1

is folded along a straight line so that

C

A

. Prove that the area of the pentagon thus obtained is less than

3/4

geometryfoldinggeometric inequalityrectangle