Avon Trig

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,