We can define symmetry as the the quality of having parts that match each other, particularly in a way that is alluring, or likeness of shape or substance.
Now here is a use of word symmetry in a sentence.
The outline of the house had a satisfying symmetry, its oval shape being grabbed in its stretched windows.
Deft means skillful or careful, so to utilize it legitimately in a sentence, here's an example;
The photographer is known for her deft utilization of lighting.
Now we use both words, deftly and symmetry in a sentence;
The designs on the floors were deftly placed, and the symmetry was great.