We report the discovery of 30 type a , b RR Lyrae ( RRab ) which are likely members of the Sagittarius ( Sgr ) dwarf galaxy .
Accurate positions , periods , amplitudes and magnitudes are presented .
Their distances are determined with respect to RRab in the Galactic bulge found also in the MACHO 1993 data .
For R _ { \odot } = 8 kpc , the mean distance to these stars is D = 22 \pm 1 kpc , smaller than previous determinations for this galaxy .
This indicates that Sgr has an elongated main body extending for more than 10 kpc , which is inclined along the line of sight , with its northern part ( in Galactic coordinates ) closer to us .
The size and shape of Sgr give clues about the past history of this galaxy .
If the shape of Sgr follows the direction of its orbit , the observed spatial orientation suggests that Sgr is moving away from the Galactic plane .
Also , Sgr stars may be the sources of some of the microlensing events seen towards the bulge .