If "O" is the origin and A(1,2),B(3,4) such that circumradius of the ΔleAOB is abc then b−ac is (where a,b,c are least possible natural numbers and a,c are coprime)

Area of ΔOAB 12|x1y2−x2y1|=12|6−4|=1

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If $" O "$ is the origin and $A (1, 2), B (3, 4)$ such that circumradius of the $Δ^{l e} A O B$ is $\frac{a \sqrt{b}}{c}$ then $\frac{b - a}{c}$ is (where a,b,c are least possible natural numbers and a,c are coprime)

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Area of $Δ O A B$
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$\frac{1}{2} | x_{1} y_{2} - x_{2} y_{1} | = \frac{1}{2} | 6 - 4 | = 1$

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