Posted by **maker** on Sunday, May 26, 2013 at 10:54am.

in the diagram below.A,B and C are three points in the same horizontal plane and AD is a vertical tower.AC=AB=x and DC=DB.the angle of elevetion of D from C is alpha and DB^C=theta

1.express DC in terms of x trigonometry value of alpha

2.prove that BC=2xcostheta/cos alpha

## Answer this Question

## Related Questions

- trig - please am stucked help me.in the diagram below.A,B and C are three points...
- trig - express 20sin theta + 4 cos theta as R sin(theta + alpha) R sin(theta + ...
- trig - On an inclined road, which makes an angle of 25 degrees with the ...
- Trig - From an observation tower that overlooks a runway, the angles of ...
- Math/Trig - From an observation tower that overlooks a runway, the angles of ...
- math - An observer of height h stands on an incline at a distance d from the ...
- math - In the given diagram,AB represents a vertical pole and CD represents a 40...
- math trig - two points A and Bare 80 feetapart on the same side of A towerand on...
- math - PQ is a vertical tower 95m high, the points R and S are on the same ...
- physics - A stone projected at angle alpha with plane inclined at angle theta ...