FERMAT 2004 Problem 14

In the diagram, ABCD is a rectangle and point E lies on AB. Triangle DEC has \angle{DEC}=90^\circ,DE=3 and EC=40. The length of AD is

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Answer Choices
A. 2.6
B. 2.4
C. 2.8
D. 1.8
E. 3.2

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