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  • https://ukrayinska.libretexts.org/%D1%84%D1%96%D0%B7%D0%B8%D0%BA%D0%B8/%D0%9A%D0%BB%D0%B0%D1%81%D0%B8%D1%87%D0%BD%D0%B0_%D0%BC%D0%B5%D1%85%D0%B0%D0%BD%D1%96%D0%BA%D0%B0/%D0%9A%D0%BB%D0%B0%D1%81%D0%B8%D1%87%D0%BD%D0%B0_%D0%BC%D0%B5%D1%85%D0%B0%D0%BD%D1%96%D0%BA%D0%B0_(Dourmashkin)/25%3A_%D0%9D%D0%B5%D0%B1%D0%B5%D1%81%D0%BD%D0%B0_%D0%BC%D0%B5%D1%85%D0%B0%D0%BD%D1%96%D0%BA%D0%B0/25.06%3A_%D0%97%D0%B0%D0%BA%D0%BE%D0%BD%D0%B8_%D0%9A%D0%B5%D0%BF%D0%BB%D0%B5%D1%80%D0%B0
    \[\Delta A=\frac{1}{2}(r \Delta \theta) r+\frac{(r \Delta \theta)}{2} \Delta r \nonumber \] \[\Delta A=\frac{1}{2} \frac{(r \Delta \theta) r}{\Delta t}+\frac{(r \Delta \theta)}{2} \frac{\Delta r}{\Del...\[\Delta A=\frac{1}{2}(r \Delta \theta) r+\frac{(r \Delta \theta)}{2} \Delta r \nonumber \] \[\Delta A=\frac{1}{2} \frac{(r \Delta \theta) r}{\Delta t}+\frac{(r \Delta \theta)}{2} \frac{\Delta r}{\Delta t} \nonumber \] \[\frac{d A}{d t}=\frac{1}{2} r^{2} \frac{d \theta}{d t} \label{25.5.4} \] Період обертання T планети навколо Сонця пов'язаний з напіввеликою віссю a еліпса тим,\(T^{2}=k a^{3}\) де k однаковий для всіх планет. \[\int_{\text {orbit }} 2 \mu d A=\int_{0}^{T} L d t \nonumber \]