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Geometry and Trigonometry / Circles Difficulty: Medium

The number of radians in a 720-degree angle can be written as $a, times pi$ , where a is a constant. What is the value of a ?

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Explanation

The correct answer is 4. There are $pi$ radians in a $180 degree$ angle. An angle measure of $720 degrees$ is 4 times greater than an angle measure of $180 degrees$ . Therefore, the number of radians in a $720 degree$ angle is $4 pi$ .