If a circle has a diameter of 40 cm and a sector with a central angle of 72° is cut from the circle, what is the circumference of the sector in centimeters?
一个圆的直径是40厘米，从该圆中剪一个圆心角为72°的扇形，该扇形的周长是多少厘米．
<gadget id="calculator">72 / 360</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3.14 * 40 * (1/5)</gadget>
<output>25.12</output>

<gadget id="calculator">25.12 + 40</gadget>
<output>65.12</output>

<result>65.12</result>