from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees.

Question

a. how far from the church was the second elevation taken?
b. calculate the height of the church spire.

Answer 1

why keep posting the same problem over and over? You know, it just may be that no one is awake in the middle of the night.

Surely by now you could have drawn a diagram and seen that if the 2nd elevation was taken at distance x, and the height is h, then

h cot35° - h cot55° = 30
x = h cot55°

Answer 2

Shut it