  Using the Navy Precision Optical Interferometer, we measured the angular
diameters of 10 stars that have previously measured solar-like oscillations.
Our sample covered a range of evolutionary stages but focused on evolved
subgiant and giant stars. We combined our angular diameters with Hipparcos
parallaxes to determine the stars' physical radii, and used photometry from the
literature to calculate their bolometric fluxes, luminosities, and effective
temperatures. We then used our results to test the scaling relations used by
asteroseismology groups to calculate radii and found good agreement between the
radii measured here and the radii predicted by stellar oscillation studies. The
precision of the relations is not as well constrained for giant stars as it is
for less evolved stars.
