The pair of spheres are congruent is S and T.
What is congruence?
Two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other.
As, per the given figure,
Figure R having a radius 3.
Figure S is having a radius 4
Figure T is having radius 4
So, by considering the property of congruence figure S and T will be congruent spheres.
Learn more about congruence here:
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