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No. The sun is a main sequence star.
No. The diameter of Sirius A is about 1.7 times that of the sun. To be considered a supergiant a star must be at least 100 times the diameter of the sun.
A supergiant is much larger than a white dwarf. A supergiant can be 10 to 70 times the size of our Sun, whereas a white dwarf is only about the size of the Earth.
The sun is neither a red giant nor a supergiant. It is currently a main sequence star, which means it is in the stable part of its lifecycle where it fuses hydrogen into helium in its core.
No, Antares is bigger than Betelgeuse. Antares is a red supergiant star with a diameter about 700 times that of the Sun, while Betelgeuse is a red supergiant star with a diameter about 600 times that of the Sun.