How can solar radii be used to describe the sizes of stars including the subgroups of white dwarfsgiants and super giants?

Solar radii provide a standardized way to compare the sizes of stars relative to the Sun, which has a radius of about 1 solar radius (R☉). White dwarfs typically have radii around 0.01 to 0.02 R☉, indicating they are much smaller than the Sun due to their collapsed nature. In contrast, giants and supergiants can range from about 10 R☉ to over 1,000 R☉, reflecting their vast sizes as they expand and evolve. This system of measurement allows astronomers to categorize and understand the scale of different stellar types within the universe.