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36 Divide by two. 18,2 Divide by two. 9,2,2 Divide by three. 3,3,2,2 Stop.
81 Divide by three. 27,3 Divide by three. 9,3,3 Divide by three. 3,3,3,3 Stop.
84 42,2 21,2,2 7,3,2,2
252 Divide by two. 126,2 Divide by two. 63,2,2 Divide by three. 21,3,2,2 Divide by three. 7,3,3,2,2 Stop. All the factors are prime.
Wrap a string around the tree and measure the length. Divide the length by pi (~3.14159); that is an approximation of the diameter (if the tree really was cylindrical. Cut the tree down measure the stump.