What is the length of an arc with a radius of 6 cm and a central angle of 150°?
半径为6厘米，圆心角为150°的弧长是多少厘米．
<gadget id="calculator">150 * 3.14 * 6</gadget>
<output>2_826</output>

<gadget id="calculator">2_826 / 180</gadget>
<output>157/10 = around 15.7</output>

<result>157/10 = around 15.7</result>