Half-angle expressions in terms of s and the area

1. A.
   $\frac{s^{2}}{\Delta}$, where $\Delta$ is the area of the triangle ABC .
2. B.
   $\frac{s}{\Delta}$, where $\Delta$ is the area of the triangle ABC .
3. C.
   $\frac{\Delta}{s}$, where $\Delta$ is the area of the triangle ABC .
4. D.
   $\Delta$, where $\Delta$ is the area of the triangle ABC .

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1. A.
   $\Delta$
2. B.
   $2\Delta$
3. C.
   $3\Delta$
4. D.
   $4\Delta$

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1. A.
   $\dfrac{[A(\triangle ABC)]^2}{abcs}$
2. B.
   $\dfrac{abcs}{[A(\triangle ABC)]^2}$
3. C.
   $\dfrac{[A(\triangle ABC)]}{abcs}$
4. D.
   $\dfrac{abcs}{[A(\triangle ABC)]}$

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