The radius of the larger circle is 5 cm and the radius of the smaller circle is 3 cm. How much smaller is the area of the small circle than the large circle.
大圆的半径5厘米，小圆的半径3厘米．小圆的面积比大圆小多少．
<gadget id="calculator">78.5 - 28.26</gadget>
<output>50.24</output>

<gadget id="calculator">50.24 / 78.5</gadget>
<output>0.64</output>

<result>0.64</result>