The height of the cylinder remains the same, and the radius of the bottom surface is reduced to the original (1/3), then the side area of the cylinder is reduced to the original value
圆柱的高不变，底面半径缩小为原来的(1/3)，那么圆柱的侧面积就缩小为原来的多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>