In this project we will find the distance across a creek (or ?) without going to the other side.
|35 cm X 35 cm rigid cardboard (14" X 14")|
|2 straight sticks (like broom handles)|
|clipboard, paper & pencil|
Choosing a Site:
Locate a stationary object near the adjacent bank for sighting purposes.
Push one stick into the ground so that it stands straight up on its own, directly across the creek from the object chosen
(This will be station #1)
(This will be station #2)
Processing the Data:
Look up the Tangent Ratio for the angle measured and MULTIPLY this by the distance between stations. The result will be the distance across the creek (in whatever units you used to measure the distance between stations).
to Tangent Tables
How it works; Using the Properties of Triangles
Please let us know what you think of this
activity on our
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(last updated 8/31/98)