9000117702

The Earth travels around the Sun on an elliptical orbit. The Sun is in the focus of this ellipse. The maximal distance from Earth to the Sun is $152.1\cdot {10}^6\mathrm{km}$, the minimal distance from Earth to the Sun is $147.1\cdot {10}^6\mathrm{km}$. Find the length of the semi-minor axis (one half of the length of the shorter axis) and round your answer to the nearest ${10}^4\mathrm{km}$.