The two structures shown (left and right) are 1-bromo-2-chlorocyclopropane with Br and Cl on the same face of the ring in each case. They are related as

Both drawings are cis-1-bromo-2-chlorocyclopropane, but with every wedge reversed, so they are mirror images. The left structure is (1R,2S) and the right one is (1S,2R) (C1 bears Br). Because the two stereocentres carry different halogens, the molecule has no internal mirror plane even in the cis form, so the mirror images are not superimposable. They are enantiomers; the cis isomer is chiral, unlike cis-1,2-dichlorocyclopropane which is meso.