Garden Granite Pieces

The granite counter tops installer gave me a large triangular left over piece that has collected dust for a few years.
I decided to cut it up into three pieces that will be used for the bases for decorative plant stands in our veggie garden.
Breaking the slab by cutting a groove on the front side with my angle grinder then whacking a brick chisel on the back side in line with the groove is the only way I could think of to do the job.
It worked moderately well... certainly good enough for the veggie garden.