The only kind of star that could be the size of the Earth would be a white dwarf.
Earth is a normal sized planet and has a magnitude of 12,756.28km and 11,533 miles round .
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pretty close to the same
surface area = Pi x d squared circumfrance of 24,000 miles at the eqator 24,000 / 3.14 = 7,643 3.14 x (7,643 x 7,643 = 58,415,449) = 183,424,510 square miles