Расчет: yGxisV - 1
S =
π * R^2* α |
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* S_ΔAOB
S = π * R^2* α |
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| / 360 |
* S_ΔAOB$$S$$ = $$\frac{\pi\cdot R^{2}\cdot \alpha}{360}\cdot S_{\DeltaAOB}$$ 
S = R^2* S_ΔAOB* α* π |
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$$S$$ = $$\frac{R^{2}\cdot S_{\DeltaAOB}\cdot \alpha\cdot \pi}{360}$$ 
S = 0.00278* R^2* S_ΔAOB* α* π
$$S$$ = $$0.00278\cdot R^{2}\cdot S_{\DeltaAOB}\cdot \alpha\cdot \pi$$ 