Using trigonometry.
By measuring a certain distance from the tree and knowing the angle of elevation you can use the tangent ratio:
tan = opp (the height of the tree)/adj (the distance)
Rearrange the formula:
opp = adj*tan
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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.
Formula for working out height of a tree is (distance from eye to base of tree/distance from eye to base of stick) x length of stick = tree height.(distance from eye to base of tree/distance from eye to base of stick) x length of stick = tree height is the formula for working out height of a tree.
Use a ruler, to find out the area do width times length.
One characteristic of a line is that the length continues on forever.You can only find the length of a line segment.
Here's 2: Length of a room and height of a tree