Tetrahedral shaped abrasive particles with predetermined rake angles

An abrasive article comprising:

• a backing;
• and
• a plurality of tetrahedral-shaped ceramic abrasive particles, wherein the plurality of tetrahedral-shaped ceramic abrasive particles are monolithic, shaped abrasive particles, and wherein each of the tetrahedral-shaped ceramic abrasive particles comprises:
• at least four major faces, wherein each of the at least four major faces comprises a triangular shape;
• at least six edges joining the four major faces;
• one of the at least four major faces being a first rake face, a second of the at least four major faces being a second rake face, and the first and second rake faces being joined along a first edge having a first length, the second rake face and a third major face being joined along a second edge, and the third major face and a fourth major face being joined by a third edge having a third length, wherein the first length of the first edge is in a range of from about 1.03 times to about 2 times the second length of the second edge and the third length of the third edge;
• wherein a dihedral angle between the first rake face and the second rake face is in a range of from about 71 degrees to about 170 degrees;
• and
• wherein each of the plurality of tetrahedral-shaped ceramic abrasive particles comprises a magnetic material or is coated with a magnetic material such that each of the plurality of tetrahedral-shaped ceramic abrasive particles is responsive to a magnetic field to provide a precise orientation of the plurality of tetrahedral-shaped ceramic abrasive particles on the backing.