A pre- engineering base line was run down a very steep hill.rather than measure horizontaily down hill with steel tape: surveyor measured the vertical angle with the theodolite and slope distance with 16m steel tape.The vertical angle was21degreeand26minutes turned to a point on a plumbed range pole 1.5mabove ground.The slope distance from the theodolite to the point on the range pole was 45.3m.The theodolites optical center was 1.4mabove the upper base line station at110+71.25
a) If the elevation of the upper station was 253m, what is the elevation of lower point
b
0What is chainage of the lower station