This case study has for its central theme the importance of tree size in both ecology and natural resource management and is designed to introduce components of forest management and policy, the importance of ecological relationships, and the challenge of managing resources for a variety of uses. Students evaluate relevant forest policy and management and discuss the related challenges. They then use basic trigonometry to estimate tree height and board feet in three different management areas from angle measurements obtained using a clinometer. Finally they consider the importance of tree height and forest management on ecological relationships among wildlife and their habitat. The case can be used as an introduction to natural resource management and the importance of multiple use management strategies; as a review of trigonometry and the use of spreadsheet software; or as an example of how mathematical concepts and science are used in natural resource management. This case was developed for use in an introductory environmental science or wildlife management course but could also be used in an advanced science high school course.