Discuss the different trees you will be measuring. Are they deciduous or evergreen?
Ask learners possible ways to measure the distance between feet and tree trunk.
If your class is ready for this, you could ask them to think about why this method works. What can you say about the sides of the triangle that is formed?
Calculate the age
Divide the circumference of your chosen tree by one of the following figures, to calculate the age.
1.88 for oak
2.50 for hazel, ash and beech
2.75 for sycamore
3.13 for pine and spruce
If your tree is not in the list above use 2.50