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Is there a quot;naturalquot;
way to measure
angles in a circle?




      Spider & web, Ugley Green, Essex by flickr user hungrybrowser
1 RADIAN
CONVERTING DEGREES AND RADIANS



                                  R
              D
                           =
                                   π
            180°


D is an angle in degrees       R is an angle in radians
Convert 20° into radians.
Convert 25° into radians.
Convert   radians into degrees.
A bicycle wheel has a diameter of 0.4 meters. A point on the outer
rim travelled 2.6 m. How many degrees has the wheel turned?
HOMEWORK

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