A bicyclist travels in a perfect circle

Riding in a perfect circle ""The Best Circular Bike Ever Made" 2003 (normal speed)"
Point 'P" represents the back wheel and Point "C" and Point "D" represent the front wheel of a bicycle, Move Point "P"
A bicyclist riding in a perfect circle
1) Can it be determined which direction a bicyclist traveled?[br][br][br][br][br][br]
Riding in a perfect circle
What does length of PD and PC represent on a bicycle?
Finding the area of the green shaded region the length PD and PC are equal to 1 unit respectively.
Area of the green shaded region?
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Information: A bicyclist travels in a perfect circle