Beyond 2 π - 2.6.10

The London Eye
The [b]London Eye[/b], or the [b]Millennium Wheel[/b], is a cantilevered observation wheel on the South Bank of the River Thames in London. The Eye is the world's tallest cantilevered observation wheel at 135 meters (443 feet) tall. https://en.wikipedia.org/wiki/London_Eye
A person at Point A rides the London Eye halfway around to Point C. What is their angle of rotation?
A person at point A rides the London Eye one full time around, starting and ending at Point A. What is their angle of rotation?
A person rides the London Eye around 3 times, starting and ending at Point A. What is their angle of rotation?
Starting at Point A, a person rides around two full times and then to Point D. What is their angle of rotation?
Using what you know about angle measures beyond [math]2\pi[/math], find the cosine of [math]4\pi[/math]
Using what you know about angle measures beyond [math]2\pi[/math], find the sine of [math]\frac{15\pi}{4}[/math]
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Information: Beyond 2 π - 2.6.10