The diameter of the base of a semi-circular cylinder is 6 cm and the height is 10 cm. Find its volume.
半圆柱的底面直径是6厘米，高10厘米，求它的体积．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">3.14 * 9 * 5</gadget>
<output>141.3</output>

<result>141.3</result>