Your class is hiking on a field trip and comes to a large hill. Just how much higher is the top of the hill from your current position? With these handy clinometers, students can indirectly measure the height of tall objects such as hills, trees, and buildings. If the distance from the instrument to the base of the object is known, then the height of the object can be determined using the laws of geometry that govern triangles. Students construct their own clinometers and then use their instruments to determine the height of various objects, indoors or out. Clinometers may also be used as altitude finders for model rockets. Includes complete instructions with reproducible student worksheets, detailed background information, and valuable Teacher Notes. Complete for 30 students working in pairs.