A circular glass tabletop has a diameter of 80 cm. If a steel frame is placed on this circular glass, how many centimeters will the frame be?
一个圆形的玻璃桌面，直径为80厘米，如果给这块圆形玻璃镶上钢制边框，边框长多少厘米？
<gadget id="calculator">3.14 * 80</gadget>
<output>251.2</output>

<result>251.2</result>