A crane is inclined at an angle of 75 degrees. A cable is fastened at point A, 30 m away from the base of the crane, and passes over a pulley at point B. As observed from A, the angle of elevation of point B is 30 degrees. The crane is adjusted so that the length of the cable from A to B is 15(sqrt10) m. What should be the new angle of inclination of the crane?

Question

ganeshie8 · Answer

do you have a diagram attached with this problem ?

anonymous · Answer

@ganeshie8  |dw:1418561736693:dw|

ganeshie8 · Answer

what about the points A and B ?

ganeshie8 · Answer

|dw:1418562268557:dw|

ganeshie8 · Answer

like that ?

anonymous · Answer

|dw:1418562665168:dw|
apply cos theta for abc triangle