Answer:
The sun is at a large distance of 1011 m from the earth. It subtends a very small visual angle (\[=\text{ 1}{{0}^{\text{9}}}/\text{ 1}{{0}^{\text{11}}}=\text{ 1}{{0}^{-2}}\]radian) at our eyes. An equal angle is subtended by a disc of \[\text{1 cm}\] diameter placed at a distance of 1 m from our eyes. So the sun appears to be a small disc.
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