In triangle ABC, angle B is obtuse. D and E are mid-points of sides AB and BC respectively and F is a point on side AC such that EF is parallel to AB. Then, BEFD is a parallelogram. State True or False.
A
True
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B
False
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Solution
The correct option is A True Given: D is mid point of AB and E is mid point of BC, F is any point on AC and EF∥AB Now, in △ABC, E is mid point of BC and EF∥AB By Mid point Theorem, F is mid point of AC Also, D is mid point of AB and F is mid point of AC Hence, by mid point theorem, DF∥BE Since, DF∥BE and EF∥ABorBD Hence, BEFD is parallelogram.