angle conversion calculator

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the independent variables of trigonometric functions have units. they are degrees (°: degree) and radians (radian). the corresponding relationship between the two is very easy to remember. you only need to master the transformation 2π = 360° (a circumferential angle is equal to 360 degrees). formula is enough. from this formula, it can be directly deduced that 30°= π/6, 45°= π/4, 60°= π/3, 90°= π/2, and so on.