- A cylinder is 18 cm high and 10 cm in diameter. What is its base area?
-个圆柱体高18厘米，直径10厘米．它的底面积是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<result>78.5</result>