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World of Shareware - Software Farm 2
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THEORY.43
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1992-07-02
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x
~
text/312/77
p
~
text/169/75
d
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text/365/5
Make a 70-20-90 triangle out
of cardboard. Tape a straw to
the hypotenuse(the side
opposite the 90 angle).
Attach a weighted string to
the vertex (point) of the 20
angle. When the string hangs
even with the leg opposite
the 70 angle, you know that
your triangle is level.
~
C502/32/3
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straw
~
text/101/118
20
~
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70
~
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Hold the triangle so the lower end
of the straw is at eye level .
~
text/197/117
You then move back or forward until the tree is
in view through the straw. If your eye level (p)
is 5' and the distance between you and the tree
(d) is 54'; the height of the tree is 54 times
the tangent of 70 plus 5 =54(2.75)+5=153.5' .
You could use any angle besides 70: The formula
is d(tan -angle of line to top)+p.
~
C354/153/3
C503/161/3
text/13/10
x=d times the
tangent of the
angle opposite
of side x.
~