Answer:
Betelgeuse
Explanation:
Stars luminosity is given by the Stefan–Boltzmann law, since the emitted energy is treated as black body radiation:
[tex]L=\sigma AT^4[/tex]
Here [tex]\sigma[/tex] is the Stefan–Boltzmann constant, A is the surface area and T is the temperature. According to this formula, if both stars have the same luminosity, then the lower temperature star must have a greater surface area.
