Answer :

Answer :

Option A) 84°

Step-by-step explanation:

Its an equilateral triangle ( since DE and EF = 5)

So they have the same angles as well ..

which means angle D = 48° and angle F = 48°

angle D + angle F + angle E = 180° (angle sum property)

48° + 48° + angle F = 180°

96° + angle F = 180°

angle F = 180° - 96°

= 84°

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