My mother is going to give a square tablecloth to the round dining table at home. The diameter of the round tabletop is 0.8m and the height is 1.2m. How long should the line be in meters?
妈妈准备给家里的圆形餐桌一块正方形桌布，量得圆形桌面的直径是0.8m，高是1.2m，若要使铺在桌面上的正方形桌布的四角恰好刚刚接触地，正方形桌布的对角线长应该是多少米？
<gadget id="calculator">1.2 * 2</gadget>
<output>2.4</output>

<gadget id="calculator">0.8 + 2.4</gadget>
<output>3.2</output>

<result>3.2</result>