弧度与角度的关系Radian Life is but a span.
1弧度约为57.3° 半圆弧所对的圆心角的弧度为π，角度为180°
sin(π/2) = 1
sin(x)中的参数x必须是radius！
度
0°
30°
45°
60°
90°
120°
135°
150°
180°
270°
360°
弧度
0
π/6
π/4
π/3
π/2
2π/3
3π/4
5π/6
π
3π/2
2π
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1弧度约为57.3° 半圆弧所对的圆心角的弧度为π，角度为180°
sin(π/2) = 1
sin(x)中的参数x必须是radius！
0°
30°
45°
60°
90°
120°
135°
150°
180°
270°
360°
0
π/6
π/4
π/3
π/2
2π/3
3π/4
5π/6
π
3π/2
2π