Last week the seventh and eighth grades celebrated Pi Day, marking the once-in-a-century 3-14-15, with some scientific, artistic, and culinary experiences.
Our main activity was a project to estimate the age of trees on part of our campus. Armed with tape measures and field guides, we went outside to record the DBH, “diameter at breast height,” for a range of trees on the property. Of course, we did not want to cut down the trees to measure the diameter of their trunks, so we measured the circumference and divided by pi to get the diameter. We then multiplied the diameter by a species-specific growth factor to get an approximate age of each tree. In the process, we needed to solve several challenges we encountered, especially given the extensive snow cover—measuring the circumference at 4.5 feet (the standard for “breast height”) while standing on several feet of snow, and identifying the tree species without leaves and cones to examine. We resolved to return again in the spring to verify and augment our data!
Back in the classroom, we explored properties of irrational numbers in general, and we heard music based on pi (which some of the students played for us) and looked at some creative data visualization techniques, also based on the digits of pi. And, of course, we ate some pie—chocolate cream and apple, to be
exact. Thanks to Daniel Foster (not only our Spanish teacher but also an environmental educator) for suggesting the idea of measuring DBH, and to Mrs. Babcock for baking the pies!
—Mrs. McGaunn and Ms. Helmick