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radian
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radian

SI unit of plane angles, an alternative unit to the degree. It is the angle at the centre of a circle when the centre is joined to the two ends of an arc (part of the circumference) equal in length to the radius of the circle. There are 2π (approximately 6.284) radians in a full circle (360°).

One radian is approximately 57°, and 1° is π/180 or approximately 0.0175 radians. Radians are commonly used to specify angles in polar coordinates.
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01 unit grid enables coordinates to be read off easily; * as a learning aid in the memorization of the coordinates of points representing multiples of 30 [degrees] and 45 [degrees] on the unit circle; * as a learning aid in the memorization of particular sine and cosine ratios; * to teach radian measure of angles.
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I suggested that they consider the following: * Note that the circumference C of a circle of diameter D is an arc length, which means that the radian measure [pi] = C/D; since D = 2r (r = the radius of a circle), then [pi] = C/2r [?
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