The line of intersection of two surfaces of a sloping roof forming an internal angle less than 180Â°, is known as

The line of intersection of two surfaces of a sloping roof forming an

1.	The line of intersection of two surfaces of a sloping roof forming an internal angle less than 180Â°, is known as
A.	ridge
B.	hip
C.	valley
D.	none of these.
Answer» D. none of these.