Avon Trig

Avon Trig
Found by	Brian
City
State	New York
Country	United States
Continent	North America
Posted on	April 7, 2006
Map Location	42° 54' 19" N, 77° 41' 34" W
Numbers	390, 390, 5, 20
Type	Advanced
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Brian Alliet, a first-timer to Road Sign Math, returns us to New York for this mathematically significant road sign.

Mr. Alliet uses some elegant trigonometry to show the hidden relationship here.

$\sin(390\times5)^\circ = \cos(390\times20)^\circ$

This sign is on US20 eastbound at the interchange with I-390 in Avon,