If a large elm tree died after it was struck by lightning. The property owner thinks he can remove it himself, but he's concerned that it will fall on his greenhouse he takes several measurements before attempting to cut it down at 3 PM he measures the shadow of the tree and finds it to be 15 feet long he also determines that the tree is 27 feet from the greenhouse what else must you know to be able to determine the height of the tree

To determine the height of the tree, you would need to know the angle of elevation from the base to the top of the tree. Without this information, it is not possible to accurately determine the height of the tree.