The hexagon ABFCDE is composed of two equilateral triangles, triangle ADE and triangle BCF, and a rectangle ABCD. The equilateral triangle has a side length of 12. In the rectangular ABCD, AB = 30. What is the length of line EF?
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数学PS
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The hexagon ABFCDE is composed of two equilateral triangles, triangle ADE and triangle BCF, and a rectangle ABCD. The equilateral triangle has a side length of 12. In the rectangular ABCD, AB = 30. What is the length of line EF?
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正确答案: D