DIstance between two objects that are not a right angle

Question

Object#1 is 100 yards from me on a 15° incline from me. Object #2 is 150 yards from me on a 25° incline from me. What is the horizontal distance between the two objects and how do you solve the problem?

Answer 1

Draw a figure.

Remember what alternate-interior angles of parallel lines are and what the sum of the angles of a triangle is.

Then use the law of cosines to get the distance you require.