Might need a friend to help a little, but it's pretty straight forward. Measure the length of the pencil(call it p) and the distance from your eye to the pencil (we'll call this a) in your outstretched hand. Now step back until the pencil appears to be the same height as the tree and measure from your eye to the base of the tree(call it d). Then the ratio of arm length to pencil length is the same as the ratio of distance to the base to height of the tree(h).
a/p = d/h
As an example, let's say the pencil is 10 inches and you hold it 30 inches from your eye, then step back 120 feet from the tree.....
30/10 = 120/h would give you a tree 40 feet tall.
There's an easier way if you know a little trig. Simply measure the distance to the base of the tree and the angle of elevation to the top of the tree. h/d = tangent of the angle so if you multiply the tangent of the angle times the distance to the tree, you get the height of the tree.
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