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4.1 Radian and Degree Measure. Objective. To use degree and radian measure. Angles. An angle is determined by rotating a ray about its endpoint. The starting point of the ray is the initial side. The ending position is the terminal side. . Angles.

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## 4.1 Radian and Degree Measure

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**Objective**• To use degree and radian measure.**Angles**• An angle is determined by rotating a ray about its endpoint. • The starting point of the ray is the initial side. • The ending position is the terminal side.**Angles**• The endpoint of the ray is called the vertex of the angle. • An angle in standard position has its initial side on the positive x-axis and its vertex at the origin.**Angles**• If the rotation of the ray is counterclockwise the angle has positive measure. • If the rotation of the ray is clockwise the angle has negative measure.**Angles**• An angle in standard position is said to lie in the quadrant in which its terminal side lies. • A central angle of a circle is an angle whose vertex is on the center of the circle.**Degree Measure**• An angle generated by one complete counterclockwise rotation measures 360°. • One generated by a complete clockwise rotation measures -360°.**Coterminal angles**• Angles that have the same initial and terminal sides are called coterminal.**Radian Measure**• The measure of an angle is determined by the amount of rotation from the initial side to the terminal side.**Definition of a Radian**• One radian is the measure of a central angle θ that intercepts an arc s equal in length to the radius r of the circle. Algebraically this means that θ = s / r where θ is measured in radians. Radian Demo http://id.mind.net/~zona/mmts/trigonometryRealms/radianDemo1/RadianDemo1.html**The circumference of a circle is 2πr. There are 2πradians**around the circumference of a circle. • There are about 6.28 radians in a full circle.**1 radians = 57.29°**• 1 degree = 0.017 radians**To convert degrees to radians:**• To convert radians to degrees**When no units of angle measure are specified, radian measure**is implied.**ExampleConverting from Degrees to Radians**• 135° 3π/4 • 540° 3π • -270° -3π/2

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