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In a triangle DEF, points A, B, and C ar...

In a triangle DEF, points A, B, and C are C are taken on DE, DF and EF respectively such that EC = AC and CF = BC. If `angleD=40^@` then, `angleACB =` ?

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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-GEOMETRY TRIANGLES-QUESTIONS
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