The effective range of a heavy machine gun is 1500 meters, if it fires horizontally at 72°, how many square meters is its control area?
一种重机枪的有效射程是1500米，如果它做72°的水平扫射，求它的控制面积是多少平方米？
<gadget id="calculator">72 / 360</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1_500 ** 2</gadget>
<output>2_250_000</output>

<gadget id="calculator">(1/5) * 3.14 * 2_250_000</gadget>
<output>1_413_000</output>

<result>1_413_000</result>