# Chapter 4 - Section 4.4 - The Trapezoid - Exercises - Page 213: 39d

DE=$\sqrt {73}$$\approx8.5 #### Work Step by Step AS=TE=3 DE^{2}=TE^{2}+TD^{2} DE^{2}=9+64 DE^{2}=73 DE=\sqrt {73}$$\approx$8.5

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