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Answer:
Isosceles, sides, angles
Step-by-step explanation:
Isosceles triangles have two sides the same size.
The theorems help us to know, A. If two sides are the same then the opposite angles are the same.
And B if two angles are the same the opposite sides are the same.
Not used: congruent (means same shape and size) nor scalene(describes a triangle with three different side lengths)