Abstract
There is observational evidence at a number of wavelengths for the interaction of the supernovae SN 1979c and SN 1980k with a circumstellar medium created by presupernova mass loss. Distance independent quantities can be used to develop a model for the interaction region. When these results are combined with a distance dependent quantity, the distance to the supernova is determined. The most useful distance dependent quantities are the radio angular diameter (from VLBI observations) and the X-ray flux. This method for distance determination is applied to the supernova SN 1979c.
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