Spread turf on a circular open space with a circumference of 628 meters, if the turf is 125 yuan per square meter. How much would it cost to cover half of this open space with turf?
在周长为628米的圆形空地上铺草皮，如果每平方米草皮125元．这块空地铺满一半面积的草皮要花费多少元？
<gadget id="calculator">628 / 2 / 3.14</gadget>
<output>100</output>

<gadget id="calculator">100 ** 2</gadget>
<output>10_000</output>

<gadget id="calculator">10_000 / 2</gadget>
<output>5_000</output>

<gadget id="calculator">3.14 * 5_000 * 125</gadget>
<output>1_962_500</output>

<result>1_962_500</result>