The radius of the moon is 1700 kilometers, and the radius of the earth is 6400 kilometers. If the earth is drawn as a circle with a diameter of 12.8 cm on a mathematical wall chart, what diameter should the moon be drawn as?
月球半径是1700千米，地球半径是6400千米，在一张数学挂图上地球画成直径12.8cm的圆，月球相应地应画成多大直径的圆？
<gadget id="calculator">12.8 / 2</gadget>
<output>6.4</output>

<gadget id="calculator">6.4 * 1_700</gadget>
<output>10_880</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 6_400</gadget>
<output>3_200</output>

<gadget id="calculator">10_880 / 3_200</gadget>
<output>17/5 = around 3.4</output>

<result>17/5 = around 3.4</result>