In any triangle, the largest side and largest angle are opposite one another.

In any triangle, the smallest side and smallest angle are opposite one another.

In any triangle, the mid-sized side and mid-sized angle are opposite one another.

If two sides are congruent (equal in measure), then the corresponding two angles will be congruent (equal in measure).

Alternately, if two angles are congruent (equal in measure), then the corresponding two sides will be congruent (equal in measure).