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Answer: 60 degrees

All sides are the same, so all angles are 60 degrees. Note how 60+60+60 = 180. So this fits with the rule that all three angles of a triangle add to 180 degrees. This is an equilateral triangle. 
McChuck
Since all the sides are congruent, the angles will also be the same. All angles of a triangle must equal 180 degrees. Out of the answers given, only 60 degrees would be the answer because 60 times 3 equals 180. You multiply by because there is 3 angles.

The answer is B.

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