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In Fig. Δ ABC is an equilateral triangle. Find m∠BEC.

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In Fig. Δ ABC is an equilateral triangle. 

Find m∠BEC.

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Since, 

Triangle ABC is an equilateral triangle 

∠BAC = 60° 

∠BAC + ∠BEC = 180°

(Opposite angles of quadrilateral) 

60° + ∠BEC = 180° 

∠BEC = 120°

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