The line of intersection of the surfaces of a sloping roof forming an external angle exceeding 180¬¨‚àû, is$

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

1.	The line of intersection of the surfaces of a sloping roof forming an external angle exceeding 180¬¨‚àû, is$
A.	Ridge
B.	Hip
C.	Valley
D.	None of these
Answer» C. Valley