The term is used especially when the pieces form a right angle.
Notice how its surface forms an angle, like a writing table.
It forms an angle of 40 to the course sailed.
The door was opened, and it formed a right angle to the doorway.
It formed an acute angle such as is never found in nature.
Once the board breaks, fold it back to form a right angle.
Turn out your feet equally, so as to form a right angle with each other.
They form an angle from 10-60 at the base.
In plan they form a right angle at the edge of the former rickyard.
About fifty people were collected at the angle formed by the end of the lake.