A surveyor finds that the face of a pyramid makes an angle of 135° with the ground, as shown. From a point 100 meters from the base of the pyramid, the angle of elevation to the top is 25°. Which of the following correctly sets up the situation to solve for length XY?

Choose-
A. Law of Cosines: (XY)2 = (100)2 + (135)2 - 2(100)(XY)(cos 25º)
B. Law of Cosines: (100)2 = (XY)2 + (135)2 - 2(100)(135)(cos 25º)
C. Law of Sines: XY/sin 25º = 100/sin 135º
D. Law of Sines: XY/sin 25º = 100/sin 20º

Question

A surveyor finds that the face of a pyramid makes an angle of 135° with the ground, as shown. From a point 100 meters from the base of the pyramid, the angle of elevation to the top is 25°. Which of the following correctly sets up the situation to solve for length XY?

Choose-
A. Law of Cosines: (XY)2 = (100)2 + (135)2 - 2(100)(XY)(cos 25º) 
B. Law of Cosines: (100)2 = (XY)2 + (135)2 - 2(100)(135)(cos 25º) 
C. Law of Sines: XY/sin 25º = 100/sin 135º
D. Law of Sines: XY/sin 25º = 100/sin 20º

anonymous · Answer

Might need a picture here...