At a dam site, a bed of sandstone is exposed on horizontal ground. If it is 25° towards East. Its width of outcrop on a level ground is 240 m, what is its vertical thickness?

At a dam site, a bed of sandstone is exposed on horizontal ground. If

1.	At a dam site, a bed of sandstone is exposed on horizontal ground. If it is 25° towards East. Its width of outcrop on a level ground is 240 m, what is its vertical thickness?
A.	101.9 m
B.	99.9 m
C.	111.9 m
D.	121.9 m
Answer» D. 121.9 m