The circumference of a semicircle part is 17.99 cm; what is the area of the semicircle in square centimeters.
一个半圆形零件的周长是17.99厘米；这个半圆的面积是多少平方厘米．
<gadget id="calculator">3.5 / 2</gadget>
<output>1.75</output>

<gadget id="calculator">3.14 * 3.5 * 1.75</gadget>
<output>19.2325</output>

<result>19.2325</result>