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我在学人民教育出版社初中几何第一册P119B7的习题时,觉得该题很有趣味,于是决定探究一下。如图,已知AB∥EF,求证:么∠F=∠B+∠F.
When I was learning the exercises in the first book P119B7 of the junior middle school geometry of the People’s Education Press, I felt that the question was very interesting and decided to explore it. As shown in the figure, AB ∥ EF is known. Prove that: ∠ ∠ F = ∠ B + ∠ F.