1. The problem statement, all variables and given/known data A vertical fence stands on the ground, and the sun is shining on it. The ground is the xy-plane, and the top of the fence is the line through the point (0,0,1) in the direction of < 3, 1, 0 >. The sun’s rays are pointing in the direction of the vector < 2,−1,−3 >. Find the region on the ground that is shaded by the fence. 2. Relevant equations A dot B = |A||B|cosθ A x B = |A||B|sinθ 3. The attempt at a solution I'm not sure how to visualize the problem. Also, what is meant by "find the region"? Are they asking for the area of the shaded ground? Can someone shed some light on this problem, or help me set it up?