A fraction such that the divisor (denominator) is zero is undefined. Such a division is expressed as x/0 where x is the dividend (numerator). In ordinary arithmetic, the expression has no meaning so division by zero is undefined.
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Well, any fraction with a zero in the denominator is undefined, and that's sometimes considered infinity.
Since there is no triangle and none of it is shaded, the answer is 0/0 which is an undefined quantity.
Undefined
By its very name .. it is UNDEFINED. Even in the Extended Real Number set containing +-infinity these elements are UNDEFINED.
Not just every whole number. Every number has a reciprocal, even 0. The reciprocal of 0 is undefined.