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The measure of angle F is 92 degrees.
The sum of the angles that are in a triangle is = 180 degrees.
One angle = 31°
The second angle = 57°
The value of F is unknown.
When we apply this law we have:
31° + 57° + F = 180°
F = 180-31-57
F = 92°
Therefore the measure of angle F is = 92°
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