Download - Weird trig 5
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Weird Trigonometry(5)
By Dave C, 2013
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Obtaining the inverse Tan without too much effort.
...in other words, getting a good approximation for the angle in a triangle given the base length and height.
dTBase
Height
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57
57
1
1)45(
d
d
dTdTan
d
dTd
57
57
dT
T
d
d
1
157
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2m
3m
e.g.,
1
157
d
d
T
Td
1
157
32
32
d
5
157d
O11.4 d
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2m
3m
e.g.,
O11.4 d
OOO 6.33 11.4 45 angle
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2m
3m
e.g.,
O11.4 d
OOO 6.33 11.4 45 angle O32-1 7.33)(Tan
Correct value:
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The approximation is accurate to within 2% for all Tan values between about 0.5 and about 2.5.
That covers a broad range of triangles.
1
157 45 O
d
d
T
Tangle
%5 1
106 45 O lessT
Tangle
d
d
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