# Measuring Tree Branch Height

March 20th Fact-of-the-DayTrees often support
the ends of wire antennas. Regardless of whether a tree is climbed,
a weight is thrown, an arrow is shot, or a gas-filled balloon is used
to get a line over a high branch, it can be difficult or impossible to
directly measure the height of a branch above ground, because of interfering
branches below. However, the trigonometric tangent function provides a
way to determine the height indirectly. If the ground is level, measure
a convenient distance (*such as 75 feet*) from a point on the ground
directly below the branch to a point away from the tree, where the branch
can be seen. Then measure the angle from the ground to the branch at that
distance and apply this formula: height = tan(angle) x distance *©2005
Martek International All rights reserved.*

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