Definition 1. We define an angle to be of measure 1 gradian if it has (radian) measure π 200 . The international symbol for the gradian is ‘gon’. Remark2.Multiplying by 100, we see that 100 gon is the same as π 2 and hence a right angle has measure 100 gon. (a) Construct a unit circle with the standard set of angles noted in both radians and gradians1. Include the sine and cosine of each of those angles.

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