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We present a careful and detailed light curve analysis of publicly available$I$-band data on fundamental mode RR Lyrae (RRab) stars of the Large MagellanicCloud (LMC) obtained by the Optical Gravitational Lensing Experiment (OGLE)phase-III project. Using the Fourier parameters of $13,095$ RRab stars,metallicities and absolute magnitudes of individual stars are obtained. Therepresentation of stars on the $P-\phi_{31}^{V}$ plane shows the existence ofthree significant metallicity groups with mean metallicities as $-1.20 \pm0.12$ dex, $-1.57 \pm 0.10$ dex and $-1.89 \pm 0.09$ dex. The correspondingabsolute magnitudes of these three groups are obtained as $0.70\pm 0.08$ mag,$0.59 \pm 0.06$ mag and $0.49 \pm 0.08$ mag, respectively. Distribution ofthese three groups as a function of vertical $|z|$ distance indicates that theformation of the LMC disk predates the formation of the inner halo. Issue ofthe existence of a metallicity gradient as a function of galactocentricdistances has also been addressed.  Approximating the structure of the LMC disk as a triaxial ellipsoid, theinclination angle ($i$) relative to the plane of the sky and the position angleof the line of nodes ($\theta_{lon}$) were estimated as $24^{\circ}.20$ and$176^{\circ}.01$, respectively. The axes ratios and the eccentricity were alsodetermined using the principal axes transformation method.

Chemical and structural analysis of the Large Magellanic Cloud using the fundamental mode RR Lyrae stars