Rectangle ABCD is inscribed in a semicircle with diameter , as shown in the figure. Let DA=16, and let FD=AE=9. What is the area of ABCD?

AMC 8 2020 Problem 18

AMC8 2020 年第 18 题

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Rectangle ABCD is inscribed in a semicircle with diameter \overlineFE, as shown in the figure. Let DA=16, and let FD=AE=9. What is the area of ABCD?

的半圆中。已知 DA=16，FD=AE=9，那么 ABCD 的面积如图，矩形 ABCD 内接在直径为𝐹𝐸 是多少？

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