The length of the arc that is subtended by a 360° angle is actually the found by the formula :. # of radians in a full circle= Therefore, radians = 360°. Rule for conversion between DEGREES 180° = 1 = # of degrees x Practice: p321 #1-4ace, 7-9ace, 11, 12 RADIANS is: radians radians =# of radians of the circle. This is Example 1: Convert from degrees to radians. a) 90° b) 270° c) 138

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