Question

the distance of the point 0, - 1 from origin is

Answer 1

it is 1 
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Answer 2

Using distance formula
$\sqrt{(xa} - xb) {} {}^{2} + (ya - yb) {}^{2}$
coordinates of origin = 0,0
then
√(0-0)²+(0+1)²
√1

distance comes out to be 1 unit