Why is it not possible to divide by zero

In mathematics, division by zero is division where the divisor (denominator) is zero. Such a division can be formally expressed as a/0 where a is the dividend (numerator). In ordinary arithmetic, the expression has no meaning, as there is no number which, multiplied by 0, gives a (assuming a≠0), and so division by zero is undefined.

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step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun