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If you remove the lines CB and FE you will get a regular parallelogram. Diagonal inside a parallelogram will bisect the angle and angle EDA will become 70. And so the same diagonal will bisect FAB and make 70. After calculating these angles draw back the lines you omitted EF and CB.Therefore, 360 - 70 - 70 - 120My question is how do you calculate EFA?
100.
I hope u get it.