Posted by eekim on Tuesday, July 12, 2011 at 10:22am.
a tower and a monumement stand on a level plane. The angles of depression of the top and bottom of monument as viewed from the top of the tower are 13 degree and 31 degree respectively. If the height of the tower is 145 ft.,find the height of the monument

trgonometry  Reiny, Tuesday, July 12, 2011 at 10:45am
Did you make a diagram?
You can find every possible angle in both triangles, one is right angled.
Start with the rightangled triangle and find its hypotenuse.
Then use the Sine Law in the next triangle. 
trgonometry  Togmae, Monday, February 2, 2015 at 8:29am
45ft