Final answer:
The angle formed by a man's jawline is called the angle of the mandible.
Step-by-step explanation:
The angle formed by a man's jawline is called the angle of the mandible, which is the outside margin of the mandible where the body and ramus come together. The mandible forms the lower jaw and is the only movable bone of the skull. It consists of a horizontal body and a vertically oriented ramus.
For example, when a person bites down or chews, one of the major muscles that pulls the mandible upward arises from the zygomatic arch, which forms the bridge of bone between the cheekbone and the temporal bone.