If the area of the large circle is 4 times the area of the small circle, and the diameter of the small circle is known to be 1 decimeter, what is the radius of the large circle in decimeters?
若大圆的面积是小圆面积的4倍，已知小圆直径是1分米，则大圆半径是多少分米分米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 2</gadget>
<output>1</output>

<result>1</result>