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.
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Diameter of the tree is 2.5 feet (7.85 ft/3.1416)
The formula for the circumference of a tree is Diameter * PI. If the circumference is known, then the diameter is equal to the circumference / PI. In this case, the diameter is equal to 5 foot 5.29 inches.
you double the radius to find the diameter.
diameter = circumference/pi
To find the diameter of a circle you multiply the radius by 2 or d=r2