Final answer:
Michelangelo used marble sculpting technique to create the Pieta, using mallets and chisels to carve the marble and then sanding and polishing it for a shiny finish.
Step-by-step explanation:
Michelangelo used marble sculpting technique in order to create the Pieta. He would have used mallets and chisels to carve the marble, starting with a rough version and then adding more detail with sophisticated tools. The final sculpture would have been sanded and polished to create a reflective shine.