Because the three sides are congruent, what foes that make each angle measure according to the equilateral triangle theorem. a 30 degrees
b 90 degrees
c 180 degrees
d 60 degrees

60degrees

Step-by-step explanation:

Congruent means equal and equilateral triangle also means a triangle which has three sides equal.

So 60 degrees is the sides for each angle since when they are added they all add up to 180°

<AC=60°

<CB=60°

<AB=60°

60+60+60=180°

∆ABC=180°

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